What is the point slope form (y-y1=m(x-x1)) of a line with a slope of 5 and goes through the point (1,5)?
What is the slope intercept form of the line? Y=mx+b

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.