1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
larisa86 [58]
2 years ago
14

How do you solve this using substitution method 17x+7y=20 Y=20x-42

Mathematics
1 answer:
Nutka1998 [239]2 years ago
4 0

Answer:

17 <em>x</em><em> </em>+ 7 y = 20

y =<em>20x</em><em> </em><em>-</em><em> </em><em>4</em><em>2</em>

<em>1</em><em>7</em><em> </em><em>x</em><em> </em><em>+</em><em> </em><em>7</em><em>(</em><em>20x</em><em> </em><em>-</em><em> </em><em>4</em><em>2</em><em>)</em><em> </em><em>=</em><em> </em><em>2</em><em>0</em>

<em>17x</em><em> </em><em>+</em><em> </em><em>140x</em><em> </em><em>-</em><em> </em><em>2</em><em>9</em><em>4</em><em> </em><em> </em><em> </em><em>=</em><em> </em><em>2</em><em>0</em>

<em>1</em><em>5</em><em>7</em><em> </em><em>x</em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em>=</em><em> </em><em>2</em><em>0</em><em> </em><em>+</em><em> </em><em>2</em><em>9</em><em>4</em>

<em>157x</em><em> </em><em>÷</em><em> </em><em>1</em><em>5</em><em>7</em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em>=</em><em> </em><em>3</em><em>1</em><em>4</em><em> </em><em>÷</em><em> </em><em>1</em><em>5</em><em>7</em>

<em>x</em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em>=</em><em> </em><em>2</em>

<em>y</em><em> </em><em>=</em><em> </em><em>20x</em><em> </em><em>-</em><em> </em><em>4</em><em>2</em><em> </em>

<em>y</em><em> </em><em>=</em><em> </em><em>2</em><em>0</em><em> </em><em>(</em><em>2</em><em>)</em><em> </em><em>-</em><em> </em><em>4</em><em>2</em>

<em>y</em><em> </em><em>=</em><em> </em><em>4</em><em>0</em><em> </em><em>-</em><em> </em><em>4</em><em>2</em>

<em>y</em><em> </em><em>=</em><em> </em><em>-2</em>

<em>there</em><em> </em><em>for</em><em> </em><em>x</em><em> </em><em>=</em><em> </em><em>2</em><em> </em><em>and</em><em> </em><em>y</em><em> </em><em>=</em><em> </em><em>-2</em><em> </em><em>is</em><em> </em><em>the</em><em> </em><em>solution</em><em> </em>

You might be interested in
I NEED HELP WITH THIS ASAP!! Please!
ziro4ka [17]

Answer:

f(g(x)) = 3(2x^3 -2)^2 - 4x + 2, and f(g(3)) = 3[2(3)^3 -2]^2 -4*3 -2 = 8102

Step-by-step explanation:

because for f(g(x)), the g(x) is the input of f(x), so put 2x^3 -2 into 3x^2 -4x +2, and you will get f(g(x)). because g(3) is the input of f(x), so find g(3) first, the answer is 52, and then put it back into f(x) which will be f(52) =[3(52)^2 - 4(3) +2], then the answer should be 8102.

8 0
3 years ago
QUESTION 3: POCKET MONEY Mr Reyan made an agreement with his son Smith who is studying in grade 12 as follows. Smith will get po
const2013 [10]

The formula for obtaining the value of a term of a sequence is given as a

as a recursive formula.

Responses:

  • The information as a sequence is; R1, 2·R1, 4·R1, 8·R1, 16·R1, ...
  • The sequence of the information is a geometric sequence

<h3>How is the given information expressed as a sequence?</h3>

The amount of pocket money Smith gets = 2 × The amount he gets in the previous day

The amount Smith gets on the first day = R1

Required:

The given information expressed as a sequence.

Solution:

The amount of money smith gets can be expressed as follows;

Amount he gets on day 1 = R1

On day 2, R2 = 2·R1

On day 3, R3 = 2·R2 = 2·2·R1 = 4·R1

On day 4, R4 = 2·R3 = 2·2·2·R1 = 8·R1

On day 5, R5 = 2·R4 = 2·2·2·2··R1 = 16·R1

The information written as a sequence is therefore;

  • R1, 2·R1, 4·R1, 8·R1, 16·R1, ...

  • The type of sequence is a<u> geometric sequence, or progression</u> where the first term is R1, and the common ratio, r = 2

Learn more about geometric sequence here:

brainly.com/question/4289731

brainly.com/question/1532378

8 0
2 years ago
The area and length of a rectangle are given. What is the width?
mars1129 [50]
I can’t really tell uu the answer but I think it’s 5 length long
5 0
3 years ago
I really need the answers please help asap
DanielleElmas [232]

Step-by-step explanation:

In a straight line theres 180 degrees and where x is you can tell its an X lines the opposites will be the same.

First you need to work out the triangles 180-122=58 and a triangle is 180 degrees so

58+40=98 180-98=82°

now working out the other triangle.

180-82=98, 43+98=141

180-141=39

and because the opposites will end up the same x=39°

4 0
2 years ago
If i want to show two lines are parallel what formula do i use?
Elena-2011 [213]

Answer:

Slope formula

7 0
2 years ago
Other questions:
  • Part A: Write an algebraic expression for 6 more than 7 times a number. (5 points)
    6·2 answers
  • Prove that the two circles shown below are similar. (10 points) Circle C is shown with a center at negative 3, 1 and a radius of
    10·1 answer
  • Graph the solution to this inequality on the number line.
    5·1 answer
  • What is the order pair for x+y=4 and x= -1
    14·1 answer
  • Please help me 4and 5
    13·1 answer
  • Constant of proportianl 6y=24x a.1 b.4 c.6 d.24
    13·2 answers
  • The domain of the function is all<br> The range of the function is all
    12·1 answer
  • A submarine on the surface of the ocean descended at a rate of 7 feet per second for 2 minutes. Then it ascended at a rate of 4
    10·2 answers
  • PLEASE HELP ME I DON'T KNOW I GIVE BRAINLIEST
    12·2 answers
  • A triangle has an area of 70 square kilometers and a height of 10 kilometers.what is the length of the base?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!