Answer:
(1, 5 )
Explanation:
6x + 3y = 21 → (1) ( subtract 6x from both sides )
3y = 21 - 6x
2x + 3y = 17 → (2)
substitute 3y = 21 - 6x into (2)
2x + 21 - 6x = 17 , that is
- 4x + 21 = 17 ( subtract 21 from both sides )
- 4x = - 4 ( divide both sides by - 4 )
x = 1
substitute x = 1 into (2) and solve for y
2(1) + 3y = 17
2 + 3y = 17 ( subtract 2 from both sides )
3y = 15 ( divide both sides by 3 )
y = 5
solution is (1, 5 )