Part A)
part B)
well, to graph a LINEar equation, since it's just a LINE, you simply need two points to graph a line, and since we know that y - x = 48.... if you want to know what's "y" when x = 7? or 7 hours, well
y - (7) = 48
y = 48 + 7
y = 55
so.. that's the point for the 7th hour, 7, 55, and you can pick any other point above, and graph it away.
part B)
well, to graph a LINEar equation, since it's just a LINE, you simply need two points to graph a line, and since we know that y - x = 48.... if you want to know what's "y" when x = 7? or 7 hours, well
y - (7) = 48
y = 48 + 7
y = 55
so.. that's the point for the 7th hour, 7, 55, and you can pick any other point above, and graph it away.