Answer:
x = - 1 , y = 5
Explanation:
y = 7x + 12 → (1)
y = - 3x + 2 → (2)
substitute y = 7x + 12 into (2)
7x + 12 = - 3x + 2 ( add 3x to both sides )
10x + 12 = 2 (subtract 12 from both sides )
10x = - 10 ( divide both sides by 10 )
x = - 1
substitute x = - 1 into either of the 2 equations and solve for y
substituting into (1)
y = 7(- 1) + 12 = - 7 + 12 = 5
then x = - 1 and y = 5