00:01
Let's start by coming up with an equation for our graph.
00:05
So we need the amount spent, which is 750, to be equal to the cost, the total cost.
00:16
Okay, so the total cost is 150 per pound of beans, so that's 1 .5 times the number of pounds of beans, which is b, plus $1 per pound of rice, so that's 1 times the number of pounds of rice, which is r.
00:36
So we have 1 .5b plus r is 7 .5.
00:41
Let's subtract 1 .5b from both sides, so we get r is negative 1 .5b plus 7 .5.
00:53
Okay, so we see that this is the equation for a line, because it's in the form of y equals mx plus b, where m, the slope, is negative 1 .5, and sorry, these are different bs, okay? the y -intercept, which is what this b stands for, is 7 .5.
01:18
Okay, so we need to graph a line with slope negative 1 .5 and y -intercept 7 .5.
01:26
Okay, so here's our graph...