Question

Solve the system of equations 2r + 2s = 50 and 2r – s = 17.

Answer 1

2r +2s = 50
2r - s = 17

Multiply the top by -1
-2r - 2s = -50
2r - s = 17
-3s = -33
s = 11

Then plug 11 in the first equation to get r
2r + 2(11) = 50
2r + 22 = 50
2r = 28
r = 14

so 11 and 14

Answer 2

R = 14
s = 11

2(14)+2(11)=50
28+22=50

2(14) - 11 =17
28 - 11 =17