Solve system of equation y=-2x+8,4x-2y=8

Kevin has just finished paying off his loan. he was assessed a service charge of $422. he paid off the principal and the interest by making weekly payments of $36.13 for four years. if the principal was $7,150, how much did kevin pay in finance charges, to the nearest dollar? a. $498 b. $365 c. $422 d. $787

What's the difference between: x≥0 and nonnegative integer. ?

Atemperature of 1.64◦f corresponds to answer in units of ◦c.