Which system of equations below has exactly one solution? y  = –8x  – 6 and  y  = –8x  + 6y  = –8x  – 6 and 1/2y  = –4x  – 3y  = –8x  – 6 and  y  = 8x  – 6y  = –8x  – 6 and –y  = 8x + 6

Can someone check if i did this correct. it’s number 4 if you’re wondering.

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.

Scenario: a rectangular plot of ground is 5 meters longer than it is wide. its area is 20,000 square meters. question: what equation will you find the dimensions? note: let w represent the width. options: w(w+5)=20,000 w^2=20,000+5 (w(w+5))/2=20,000 w+2(w+5)=20,000