Use the point-slope equation to identify the slope and the coordinates of a point on the line y – 4 = (x – 1).
The slope of the line is .
A point on the line is .

Suppose that the price p, in dollars, and the number of sales, x, of a certain item follow the equation 4 p plus 4 x plus 2 pxequals56. suppose also that p and x are both functions of time, measured in days. find the rate at which x is changing when xequals2, pequals6, and startfraction dp over dt endfraction equals1.5.