Question

Use linear combinations to solve v-w=-5 v+2w=4

Answer 1

v - w = -5...multiply by -1
v + 2w = 4
--------------
-v + w = 5 (result of multiplying by -1)
v + 2w = 4
--------------add
3w = 9
w = 9/3
w = 3

v - w = -5
v - 3 = -5
v = -5 + 3
v = -2

solution is : (-2,3)