Question

Someone plzz help you get 10 points.

Jason wants to solve the following system using the elimination method:

x + 3y = 10
2x + y = 5

What number should the equation 2x + y = 5 be multiplied by to eliminate y?

a. 2
b. -3
c. -2
d. 3

Answer 1

No single Correct answer. Both b and d will work

Explanation:

You want to get rid of y.

The first equation has a 3 in front of the y

Therefore you would have to multiply the second equation by 3 or - 3

If you use -3 you would add the two equations

If you use 3 you would subtract the two equations.

It is either b or d. Both will give you the same answer.

- Three

x + 3y = 10

-6x - 3y = - 15 Add

-5x = - 5 Divide by - 5

x = -5/-5

x = 1

+ Three

x + 3y = 10

6x + 3y = 15 Subtract

-5x = - 5

x = -5/-5

x = 1 Same thing.