What is the solution to this system of equations?
x-2y=15
2x + 4y=-18

x = 3; y = -6

Step-by-step explanation:

 x - 2y =  15

2x + 4y = -18

Multiply both sides of the first equation by 2. Write the second equation below it, and add the two equations.

     2x - 4y = 30

(+)  2x + 4y = -18

     4x         = 12

4x/4 = 12/4

x = 3

Now we substitute 3 for x in the first equation and solve for y.

x - 2y = 15

3 - 2y = 15

-2y = 12

y = -6

x = 3; y = -6

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step-by-step explanation:

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