00:03
So this equation, y equals 100 minus 0 .02x tells you how much you would have to pay with a club membership.
00:11
So the membership has $100 membership fee, but they also give you a 2 % return on any of your purchases, which is represented by the 0 .02x.
00:22
So let's say that you purchase $2 ,400 worth of stuff.
00:27
How much would you have to pay for this club? so we have y equals 100 minus 0 .02 times 2 ,400.
00:40
And we get $52.
00:45
Now what if you want the total club membership or the total club fees to only be $50? in other words, we want y to be $50.
00:55
So in this case, we would set 50 equal to 100 minus 0 .02x.
01:03
So we subtract 100 from both sides.
01:07
So we get negative 50 equals negative 0 .02x.
01:14
And then we divide by 0 .02...