What is the slope or gradient of this line. Once you know the slope m youre halfway there. The slope of a line is a measure of how steep the line is which is found be determining how many units the line moves vertically per how many units it moves horizontally.
Just plug the given values into your point-slope formula above.
We have that x 1 1 y 1 5 x 2 3 y 2 7. Where you see x_1 use 4. Represent equations from point slope form to slope intercept form. That would be equal to 6 53 b.