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
nadezda [96]
3 years ago
8

Solve for x eliminate y

Mathematics
1 answer:
AnnZ [28]3 years ago
6 0

Answer:

x = - 6

Step-by-step explanation:

given the 2 equations

3x + 5y = - 13 → (1)

2x - 3y = - 15 → (2)

To eliminate y from the equations we require their coefficients to be equal so that when we add the equations y is eliminated

multiply equation (1) by 3 and equation (2) by 5

9x + 15y = - 39 → (3)

10x - 15y = - 75 → (4)

add (3) and (4) term by term

(9x + 10x) + (15y - 15y) = (-39 - 75 )

19x = - 114 ( divide both sides by 19 )

x = - 6

To find y substitute x = - 6 into either (1) or (2)



You might be interested in
How many nines are in 63?
dem82 [27]

Answer:

7

Step-by-step explanation:

9×7 = 63

8 0
3 years ago
2(x-+2)+4=6x-4(-1+x)
sertanlavr [38]

2x-4+4=6x+4-4x

2x=2x+4

c there is no solution

8 0
3 years ago
Read 2 more answers
A school bought pens, each costing $1, and pencils, each costing $0.5. The cost of the whole purchase was $220. How many pens an
Aleks [24]

Answer:

<u>The number of pens = 120 and the number of pencils = 200</u>

Step-by-step explanation:

Let the number of pens x, and the number of pencils is y

the cost of one pen $1, and the cost of one pencil $0.5

The cost of the whole purchase was $220

1 * x + 0.5 * y = 220

x + 0.5 y = 220 ⇒ eq.(1)

there were 80 more pencils than pens

y - x = 80 ⇒ eq.(2)

from eq.(2) x = y - 80

By substitution with x from the last equation at eq.(1)

∴ (y - 80) + 0.5 y = 220

1.5y = 220 + 80 = 300

y = 300/1.5 = 200

x = y - 80 = 200 - 80 = 120

<u>So, the number of pens = 120 and the number of pencils = 200</u>

7 0
3 years ago
Erik buys 2.5 pounds of cashews.If each pound of cashews $7.70,how much will he pay for the cashews???I put Erik will pay $49250
Fittoniya [83]
The answer should be $ 19.25. All you have to do is $7.70 * 2.5 which = $19.25
3 0
3 years ago
Read 2 more answers
Find the area of the regular polygon. Round to the nearest tenth.
ladessa [460]

Answer:

374.123 m^2

rounded it would be 374.1 m^2

4 0
3 years ago
Read 2 more answers
Other questions:
  • Identify the relationship (complementary, linear pair/supplementary, or vertical) and find the measure of angle b in the image b
    5·2 answers
  • 253 - 17 X3<br> 85 + 52 - 36
    11·1 answer
  • What does 8,972 ÷9 =​
    11·1 answer
  • 73 POINTS! PLEASE HELP
    5·1 answer
  • Question:
    8·1 answer
  • Eleven purple marbles, seven orange marbles and two pink marbles are in a bag. What is the probability of selecting a purple mar
    15·2 answers
  • 1. Choose the correct symbol to compare. 8/10<br> 3/4<br> &lt;<br> &gt;<br> =
    7·2 answers
  • Solve the equation 8 + 32 = 5 + r
    15·1 answer
  • Long division and synthetic division show all steps please help i need this to pass​
    14·1 answer
  • Solve the inequality <br>|7x|+3&lt;21​
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!