Question

Solve 3x-y=-12
x+y=18

Answer 1

(1.5, 16.5 )

Explanation:

Given the 2 equations

3x - y = - 12 → (1)

x + y = 18 → (2)

Adding the 2 equations term by term will eliminate the y- term

4x + 0 = 6

4x = 6 ( divide both sides by 4 )

x = 1.5

Substitute x = 1.5 into (2) and evaluate for y

1.5 + y = 18 ( subtract 1.5 from both sides )

y = 16.5

solution is (1.5, 16.5 )

Answer 2

Y = 18 - x
3x - 18 + x = -12
4x = 30
X = 30/4
= 7 1/2