Answer:
So we know that 5x+10 and x +16 should give us 56. So let's combine the like terms.
1) 6x+26=56
Now lets solve for x.
2) 6x=30
x=5
3) To solve for AB and BC we will plug in the value of x.
AB= (5) + 16= 21
BC= 5(5)+10= 35
You can also double check the right answer by checking whether 21+35 = 56, and in this case it does.
