x-y=21 ⇒ x=y+21
x+13=2y
Substitute y+21 for x into the equation x+13=2y
So y+21+13=2y
Simplify 34=y
So Danielle is 34 years old. Plug y back in to the original equation
x-34=21
x=55
Tony is 55 years old
Answer:
C. 66
Step-by-step explanation:
took it on ed
15 miles per hour is the correct answer. Did I help?
Answer:
i really dont know how to do this
Step-by-step explanation: