Answer:
X = - Y/2 + 2
12x + 6y = 24
add -6 to both side
12x + 6y + -6y = 24 + -6y
Combine like terms:
6y + -6y = 0
12x + 0 = 24 + -6y
12x = 24 + -6y
Divide each side by '12'
x = 2 + -0.5y (your answer)
