what is the solution of the following system

Question

{3x + 3y =10
{-9x-9 =-30

Can you show step by step please.

Answer 1

multiply the top equation by 3, and you have (assuming a typo in the 2nd equation)

9x+9y = 30
-9x-9y = -30

add them to get

0 = 0

So, the two equations are really the same thing. Any (x,y) that satisfies the first will also satisfy the second.

3x+3y=10
y = (10-3x)/3

So, pick any value for x, and you can solve for y to satisfy the equations.

Answer 2

Y=2x+10