Answer:
Given equations:
- a) -3x + 3y = 9
- b) 2x - 7y = -14
<u>Make x the subject in equation 1</u>:
- -3x + 3y = 9
- -3x = 9 - 3y
- x = y - 3
<u>Substitute this into equation 2</u>:
2(y - 3) - 7y = -14
2y - 7y = -14 + 6
-5y = -8
y = -8/-5
y = 1.6
Then x = y - 3
= 1.6 - 3
= -1.4
Solution: (x, y) ⇒ (-1.4, 1.6)