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
Black_prince [1.1K]
2 years ago
15

Use method of subtitution, will give brainliest, 20 pts

Mathematics
2 answers:
Anni [7]2 years ago
7 0

The answer is x = 3, y = -2 or (3, -2).

We are given that :

  1. <u>2x + 5y = -4</u>
  2. <u>y = x - 5</u>

Let us substitute the 2nd equation's value of y in the 1st equation.

  • 2x + 5(x - 5) = -4
  • 2x + 5x - 25 = -4
  • 7x = 21
  • x = 3

Now, substitute for x in the 2nd equation.

  • y = 3 - 5
  • y = -2
Kitty [74]2 years ago
5 0

Answer:

x=3

y = -2

Step-by-step explanation:

2x+5y = -4

y = x-5

We want to use substitution

In the first equation, every time we see y, substitute x-5

2x + 5( x-5) = -4

Distribute

2x + 5x -25 = -4

Combine like terms

7x -25 = -4

Add 25 to each side

7x -25+25 = -5+25

7x = 21

Divide each side by 7

7x/7 = 21/7

x=3

Now we can find y

y = x-5

y = 3-5

y = -2

You might be interested in
What is the inverse of f if f (x) = ^3 sqrt x-7
Tcecarenko [31]
The inverse of the function given will be:
f(x)=(x-7)^(1/3)
to get the inverse we make x the subject
let f(x)=y=(x-7)^(1/3)
y=(x-7)^(1/3)
getting the cube of both sides we have:
y³=[(x-7)^(1/3)]³
y³=x-7
thus
x=y³+7
next we replace y by x and x with f^-1(x)
thus the inverse will be:
f^-1(x)=x³+7
7 0
4 years ago
Read 2 more answers
Plz help will mark brainliest if right
Murrr4er [49]

Answer:

c.

Step-by-step explanation:

8 0
3 years ago
What is the value of f(4), if f(x) = 2x - 16?
SVEN [57.7K]
The values would be F(x)=-8
8 0
3 years ago
Read 2 more answers
Solve interval notation. -1&lt;1/4x-1&lt;3
Amiraneli [1.4K]

Answer:

0<x<16

Step-by-step explanation:

4 0
3 years ago
Rita and Tina each make $11 an hour working as cashiers at a supermarket. Last week, Rita worked r hours while Tina worked t hou
Hoochie [10]

Answer: Rita and Tina's total weekly wages can be represented as  11r + 32 + 11t or 11( r + t ) + 32

Step-by-step explanation:

Since, For Rita,

Charges per hour =  $ 11

Working time = r hours,

Overtime charges for a week = $ 32,

Thus, her weekly charges = 11 r + 32

Now, For Tina,

Charges per hour  = $ 11

Working time = t hours,

Thus, her weekly charges = 11 t

Hence, the combined weekly wages of both Rita and Tina = 11 r + 32 + 11 t

= 11( r + t ) + 32

Which is the required expression.

5 0
3 years ago
Read 2 more answers
Other questions:
  • Brent’s pickup truck can carry 1/5 ton . Nina’s pickup truck can carry 500 pounds.Whose pick up truck can carry more weight? Exp
    8·1 answer
  • James had 18 pairs of shoes he gave 1/3 of them to his younger brother he gave 4 pairs to his friend Sammy then he split the rem
    7·1 answer
  • A runner runs at a speed of 8m/s for 2 minutes work out the distance travelled.
    6·1 answer
  • Write 7x-y=8 in the form of y=my+b
    10·1 answer
  • One forth of a number is -60​
    5·1 answer
  • Construction worker’s planned to secure a tall pole using two cables attached to the pole at a point 12 m above the ground as sh
    15·1 answer
  • Find the slope of the line that passes through A(0, -5) and B(3,-4)
    13·1 answer
  • AAH HELP PLEASSSSSSSSSSSSSE (i'll try to mark brainiest for the first person that helps me)
    7·1 answer
  • Can u plz help me with this :)
    13·1 answer
  • Evaluate 6y + x9<br> When x = -5, y = -4
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!