Answer:
x = 1.85, y = - 1.5
Explanation:
Given the 2 equations
40x - 3y = 78.5 → (1)
- 20x + y = - 38.5 → (2)
Multiplying (2) by 3 and adding to (1) eliminates the y- term
- 60x + 3y = - 115.5 → (3)
Adding (1) and (3) term by term to eliminate y
- 20x = - 37 ( divide both sides by - 20 )
x = 1.85
Substitute x = 1.85 into either of the 2 equations and solve for x
Substituting into (2)
- 20(1.85) + y = - 38.5, that is
- 37 + y = - 38.5 ( add 37 to both sides )
y = - 1.5