Answer:
9. R=7
10. r=7
11. y=6
Step-by-step explanation:
9. substitute in 24-2R for t
10R-7t=0
10R-7(24-2R)=0
10R-168+14R=0
24R=168
R= 7
10. substitute -3r for q
5r+q=14
5r+(-3r)=14
2r=14
r=7
11. x-y=2
x=2+y
substitute 2+y for x
x+y=14
(2+y) + y = 14
2y=12
y=6
