Question

20. You join a paperback book club for $6 and then spend $3 per book. Y = 3x + 6. Explain how to graph the equation, using the y-intercept and slope. Be sure to tell where you place the first point and how to find the location of the second point

Answer 1

hmm well
the y intercept is when x=0
so y= 3(0) +6
y=6 is where the graph will cross the y axis
that coordinate is (0,6)

the slope is 3 meaning move up 3 then across 1
also the x intercept is when y=0
so then we have 0=3x+6
-6=3x
-2=x
so the x intercept is at the coordinate
(-2,0)

and now we know how the function behaves and where it crosses both axes's