Answer:
x = 0 , y = - 1
Explanation:
given the 2 equations
18x + 4y = - 4 → (1)
- 9x + 8y = - 8 → (2)
multiplying (2) by 2 and adding the result to (1) will eliminate x
- 18x + 16y = - 16 → (3)
add (1) and (3) term by term to eliminate x
(18x - 18x) + (4y + 16y) = - 4 - 16
0 + 20y = - 20
20y = - 20 ( divide both sides by 20 )
y = - 1
substitute y = - 1 into either of the 2 original equations and solve for x
substituting into (1)
18x + 4(- 1) = - 4
18x - 4 = - 4 ( add 4 to both sides )
18x = 0 ⇒ x = 0
solution is x = 0 , y = - 1