Question

2r + 2s = 50 and 2r – s = 17.

A. r = 3, s = 11
B. r = –8, s = 33
C. r = 14, s = 11
D. r = 25, s = 33

Answer 1

Option C

Explanation:

2r+2s=50

2r-s=17

subtract both the equations

you'll get

3s=33

divide 3 on both sides

s=11

substitute s=11 in any of the 2 equations

2r-s=17

2r-11=17

add 11 both sides

2r=28

divide 2 both sides

r=14