Question 844969
c=2b and that c-5=b+10
work on the second equation
add 5 to each side
c = b + 15
since c=2b and c = b + 15
2b = b + 15
add -b to each side
b = 15
c = 2*15 = 30
Test c-5 = b+10
30-5=15+10
25=25