8x+15=7
In the statement the phrase the sum of can tell you that it is going to be an addition problem. So 8x ( eight times a number) would be added to the 15, 8x+15. Since its an addition problem the part where it says ' ... is seven', you know that it will all equal 7. So the answer would be 8x+15=7.
Here is a picture of the graphed function.
The grey dots are, from left to right:
(-3,0)
(-1,-4)
(0,-3)
(1,0)
do you want an expression?
if so it would be T = 40 + 20h
t = total
h = hour(s)
6(54 + 48). I'm not sure what this question is asking but the GCF is 6. That is all I did pretty much.
In an equation using x is just a place holder because those numbers are variables so it doesn't matter whether it is x or w.
