Question

Solve the following system of equations:
x+2y=-4
x-2y=8

Answer 1

x=2 y=-3

Explanation:

We first need to isolate x to get x+2y=-4:x=-4-2y

-4-2y-2y=8

simplify:

-4-4y=8.

We can also do the same for y which is -4-4y=8:y=-3

for the x, we can now substitute it to give us:

x=-4-2(-3)

-4-2(-3)=2

x=2

So, our answers are x=2 and y=-3

Answer 2

Explanation:

x+2y=-4

x-2y=8 Add

2x = 4 Divide by 2

2x/2 = 4/2

x = 2

x + 2y = - 4 Substitute 2 for x

2 + 2y = - 4 Subtract 2 from both sides

2y = - 4 - 2

2y = - 6 Divide by 2

2y/2 = - 6/2

y = - 3