Question

Solving the system: -3u + 8v = -28 and 9u- 4v = 44, will give u=____ will give v=____

Answer 1

-3u+8v=-28x9
9u-4v= 44x-3

-27u+72v=252
-27u+12v= -132
60v=384
Divide both sides by 60
60v= 384
60. 60
v=6.4

Substitute v=6.4 in equ 1
-3u+8(6.4)= 28
-3u+51.2=28
-3u=28-51.2
-3u=-23.2
Divide both sides by-3u
-3u=-23.2
-3. 3
u=7.73
Therefore u=7.73 and v=6.4