What will be the coordinate pair for point X

What is the slope of a line that is perpendicular to y = 3x + 1

Ten times the square of a non-zero number is eqaul to ninety times the number

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.