Solve the following system of equations using substitution.
y =5x -7
-3x -2y = -12
a) -3x - 2( 5x -7) = -12
b) -3x - 10x + 14 = -12
-13x = -12 - 14
-13x = -26
x = -26 / -13 = 2
c) y = 5(2) - 7 = 10 - 7 = 3
d) ( x , y) = ( 2,3)
