Question

Can someone help me with these questions. it's substitution method.

please show your work.
thanks in advance.​

Answer 1

9. R=7

10. r=7

11. y=6

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