Question

Use elimination to find the solution to the system of equations.
-x + 2y = 15
5x + 5y = -30

A. x = 3, y = 9
B. x= -5, y = 5
C. x = -9, y = 3
D. x = -3, y = -3

Answer 1

first multiply the first equation by 5
then add this to the second equation
this will eliminate the 'x' terms.

Answer 2

what do you mean by multiply it by 5?

Answer 3

multiply every term in the equation by 5
-x + 2y = 15
* by 5 gives
-5x + 10y = 75

Answer 4

now adding this to second equation eliminates 'x'

-5x + 10y = 75 +
5x + 5y = -30

Answer 5

can you do the addition? @MysticFury