Answer:
x = 1
Explanation:
3x + 3y = 6 → (1)
x + 6y = 7 → (2)
multiplying (1) by - 2 and adding to (2) will eliminate y
- 6x - 6y = - 12 → (3)
add (2) and (3) term by term to eliminate y
(x - 6x) + (6y - 6y) = 7 - 12
- 5x + 0 = - 5
- 5x = - 5 ( divide both sides by - 5 )
x = 1