Question

-v + w = 7
v + w = 1​

Answer 1

V=-3
W=4 the reason is -3 multiplied by - will become +3 and so -v+w =7
And same -3+4=1
Hence proven

Answer 2

V=-3

W=4

Explanation:

-v + w = 7

v + w = 1

`\space \space`2w=8

`\space \space`w=8/2

`\space \space`w=4

`\space \space`

-v+w=7

-v+4=7

-v=7-4

-v=3

(-1)-v=(-1)3

V=-3

`\space`

.....