Use substitution to solve the system of equations.

y = - 2x

x - 3y = 21

(3, 4)

(-6, 12)

(3, - 6)

(-2, - 6)

If one store is selling 3/4 of a bushel of apples for 9$, and another store is selling 2/3 of a bushel of apples for 9$, which store has the better deal? Explain your answer

four sisters contributed equally to buy a present for thier father. They receive a 10% discount on the original price of the gift. after the discount was taken each sister paid 13.50. what was the original price of the gift?

A marine biologist is preparing a deep-sea submersible for a dive. The sub stores breathing air under high pressure in a spherical air tank that measures wide. The biologist estimates she will need of air for the dive.

10n = 40 (solve for n)

Your gas bill went up from $125 per month to $150. What is the percent increase

What is the answer to 6 * 4/5

What is the distance, to the nearest hundredth, from (6, 5) to (-3, - 8) ?

My number has 2hundreds. The tens digit is 9more than the ones digit. My number is=

Ted says that 3 tenths multiplied by hundred equal to 300 thousandths is he right?

What number has 5 thousands, 6 hundreds, 2 tens, and 1 one?