00:02
So for the equation, 3f minus s equals 24, where f, the x axis, stands for foot length and inches, and s the y axis stands for shoe size.
00:14
If we're trying to find the shoe size of a person whose foot is 11 .5 inches, we would solve.
00:20
We would plug in for f, 11 .5, minus s equals 24.
00:28
3 times 11 .5 is 34 .5 minus s equals 24.
00:37
We're going to subtract 34 .5 from both sides, leaving us with negative x, negative s equals negative 10 .5.
00:49
Keep in mind that negative s is really negative 1s.
00:53
So we're going to go ahead and divide by negative 1 here, divide by negative 1 here, giving us s equals 10 .5.
00:59
So the shoe size would be 10 .5.
01:04
So for b, in order to find the y intercept, that's when the x value is zero.
01:11
So we're going to go ahead and put zero in here for the x value minus s equals 24.
01:19
That gives us negative s equals 24, divide by negative one, divide by negative one.
01:26
So s equals negative 24.
01:29
So the y intercept would be 0, negative 24.
01:34
The x intercept is when y is zero...