Question

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)

Answer 1

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)