x = 3y - 6

2x - 4y = 8

Solve the system of equations using substitution. A) (-12,-2)

B) (15,7)

C) (21,9)

D) (24,10)

X = 3y - 6 ... so sub 3y - 6 in for x in the other equation

2 (3y - 6) - 4y = 8

6y - 12 - 4y = 8

2y = 8 + 12

2y = 20

y = 20/2

y = 10

x = 3y - 6

x = 3 (10) - 6

x = 30 - 6

x = 24

solution is (24,10)