When y is one, x is negative one, or when x is negative one, y is one. So x is negative one here. And so this is the same thing as three plus positive one. And so this is equal to 1 4th. And so the equation of our line is going to be y is equal to 1 4th x plus b. Now we need to solve for b. And we know that the point negative one comma one is on the line, so we can use that information to solve for b.