3x+13y=-111 6x+15y=-123 solve the following system of equations using any method

Multiply the first equation by two to get:

6x + 26y = - 222

Subtract the equations from one another:

6x + 26y = - 222

Subtract 6x + 15y = - 123

This gives you:

11y = - 99

So y = - 9

Sub y = - 9 into

3x + 13 (-9) = - 111

3x - 117 = - 111

3x = 6

X = 2