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
aev [14]
3 years ago
6

Solve the system by substitution. y=2x^2-3x-1 y=x-3

Mathematics
2 answers:
padilas [110]3 years ago
6 0
The answer is B(1,-2). This is the only point where the two lines intercept. & if you plug the numbers into the equations they fit.
vekshin13 years ago
4 0

Answer:  The correct option is (B) (1, -2).

Step-by-step explanation:  We are given to solve the following system of equations by substitution method :

y=2x^2-3x-1~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)\\\\y=x-3~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(ii)

Substituting the value of y from equation (ii) in equation (i), we get

x-3=2x^2-3x-1\\\\\Rightarrow 2x^2-4x+2=0\\\\\Rightarrow x^2-2x+1=0\\\\\Rightarrow (x-1)^2=0\\\\\Rightarrow x-1=0,~~~x-1=0\\\\\Rightarrow x=1,1.

Substituting x = 1 in equation (ii), we get

y=1-3=-2.

Thus, the required solution is (x, y) = (1, -2).

Option (B) is correct.

You might be interested in
Help please
kifflom [539]

Answer:

1. false

2. false

3. true

Step-by-step explanation:

4 0
3 years ago
The longest side of the triangle section is 4 feet shorter than twice the shortest side. The third side is 3 feet longer than th
Katarina [22]
<h3>Answers:</h3><h3>The shortest side is 15 ft</h3><h3>The middle side is 18 ft</h3><h3>The longest side is 26 ft</h3>

===========================================

Define the three sides to be a,b,c such that a < b < c

So c is the longest side, and 'a' is the shortest with b in the middle.

"longest side is 4 ft shorter than twice the shortest side" means that c = 2a-4

"third side is 3 ft longer than the shortest side" so b = a+3

Both b and c are in terms of 'a', allowing us to do substitutions like so

a+b+c = perimeter

a+b+c = 59

a+(a+3)+c = 59 .... first substitution, plug in b = a+3

a+(a+3)+(2a-4) = 59 ... second substitution, plug in c = 2a-4

4a-1 = 59 .... combine like terms

4a = 59+1 ... add 1 to both sides

4a = 60

a = 60/4 ... divide both sides by 4

a = 15

The shortest side is 15 ft

b = a+3 = 15+3 = 18

The middle side is 18 ft

c = 2a-4 = 2*15-4 = 26

The longest side is 26 ft

---------------------

Check:

The three sides should add up to a perimeter of 59 ft

a+b+c = 15+18+26 = 59

so the answer is confirmed

6 0
3 years ago
Read 2 more answers
16^1/4 = <br> a. 1/2<br> b. 2<br> c. 4
stiv31 [10]

Answer:

c

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
6 7 8 but mostly 6 I know it but it's confusing
bazaltina [42]
Well divide them. 2/3=0.666 repeated. So use a bar over the top of the third six.
6 0
3 years ago
In ∆ KLM above, NO // ML and &lt; KNO = &lt; KON. Find m &lt; MNL =
4vir4ik [10]

Answer: In ∆ KLM above, NO // ML and < KNO = < KON. Find m < MNL =

Step-by-step explanation: dUNNO

6 0
2 years ago
Other questions:
  • Given that ABC ~ DEF, if EF = 7.5 what is the length of ?<br><br><br><br> 6.5<br> 6<br> 5<br> 5.5
    10·1 answer
  • Can someone please help, ty!!
    11·2 answers
  • Y varies directly as x. If y=4 when x=16 find x when y = -2
    6·2 answers
  • Plz help me! I don't understand how to do this.​
    10·2 answers
  • What is the main kind of figurative language is in this poem?
    5·2 answers
  • A building brick weighs 2.7 kilograms. work out the weight of 840 bricks. give the answer in tonnes
    5·1 answer
  • Which of the rectangular boxes shown has the greater volume?
    7·1 answer
  • Solve for v.<br> -8 = v + 4
    9·2 answers
  • Help me i need this grade but im bad at math
    7·1 answer
  • A circular hot spring has a diameter of 96 meters. Over time, the diameter of the spring decreases by 8 meters. By how many squa
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!