Question

Addition method issues. Every time I solve it is wrong answer

Answer 1

(x, y ) = (2, - 7 )

given the 2 equations

10x + y = 13 → (1)

- 4x - 8y = 48 → (2)

multiply (1) by 8

80x + 8y = 104 → (3)

add (2) and (3) term by term to eliminate the term in y

(- 4x + 80x ) + (- 8y + 8y ) = (48 + 104 )

76x = 152 ( divide both sides by 76 )

x = 2

substitute x = 2 in either (1) or (2) and solve for y

(1) → 20 + y = 13 ( subtract 20 from both sides )

y = - 7

solution is (x, y ) = (2, - 7 )