Solve each system of equations by substitution or elimination. Fill in the blanks for your answers below, example (X, Y), where X and Y would be the numbers you found in your solution.
(
- 4x +y=6
-5x - y = 21
Blank 1:
Blank 2:
Help !!!

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.