substitution method 3x + y=12

8x-2y =4

2 answers

so, substitute: y = 12 - 3x

8x - 2(12-3x) = 4
8x - 24 + 6x = 4
14x = 28

x = 2
so, y = 6
y = 12 - 3x

8x - 2y = 4

Substitute 12-3x for y in second equation and solve for x. Insert that value into the first equation and solve for y. Check by inserting both values into the second equation.