Answer:
(1, 9 )
Step-by-step explanation:
Given the 2 equations
- x + y = 8 → (1)
y + 3x = 12 → (2)
Subtracting (2) from (1) term by term will eliminate the term in y, that is
(- x - 3x) + (y - y) = (8 - 12)
- 4x = - 4 ( divide both sides by - 4 )
x = 1
Substitute x = 1 into either of the 2 equations and solve for y
Substituting in (2)
y + 3(1) = 12
y + 3 = 12 ( subtract 3 from both sides )
y = 9
Solution is (1, 9 )
