Question

solve the system of equation 2r+2s=50 and 2r-s=17

a. r=14,s=11
b.r=-8,s=33
c.r=3,s=11
d.r=25,s=33

Answer 1

2r + 2s = 50
2r - 1s = 17
3s = 33
3 3
s = 11
2r - s = 17
2r - 11 = 17
+ 11 + 11
2r = 28
2 2
r = 14
(r, s) = (14, 11)