Answer:
(2, 3 )
Explanation:
- x + 3y = 7 → (1)
x - 4y = - 10 ( add 4y to both sides )
x = 4y - 10 → (2)
Substitute x = 4y - 10 into (1)
- (4y - 10) + 3y = 7 ← distribute parenthesis by - 1
- 4y + 10 + 3y = 7
- y + 10 = 7 ( subtract 10 from both sides )
- y = - 3 ( multiply both sides by - 1 )
y = 3
Substitute y = 3 into (2)
x = 4(3) - 10 = 12 - 10 = 2
solution is (2, 3 )