3.3×-2y=-7 2×+y=11 4.2×+y=11 ×-4=-2

3.) 3x-2y = -7 | ×2
2x+ y = 11 | ×3
________|
6x-4y = -14
6x+3y = 33
_________ -
- y = 19
y = 19/1
= 19

4.) 2x+y = 11 | × 1
x -4y = -2 | × 2
__________|
2x+y = 11
2x-8y = -4
_________ -
-7y = 7
y = 7/7
y = 1