What is the solution of equations?

Y = - 3x-2

5x+2y=15

Since y=-3x - 2 we shall replace this value of y in the second equation to get ...

5x+2 (-3x-2)

=5x-6x-4

=-x-4, take the - 4 to the other side and so we shall have

-x=4, divide both sides by - 1 to get x=-4

So we shall go back to our first equation and replace x with the value we have so we shall get ...

Y=-3 (-4) - 2

Y = 10