Do you know how to graph by finding the x and y intercepts? Or can you solve for y so your equation looks like y=mx+b?
x=6, add thirty to both sides 6 squared is 36, plus six is 42
If x=first even number in sequence, then the next even number would be that number plus 2, plus 4, and so on.
x + (x+2) + (x+4) + (x+6) + (x+8) = 100
5x+20=100
5x=80
x=16
