Which of these shows the result of using the first equation to substitute for y in the second equation, then combining like terms?
y = 3x
3x + 2y = 18
A. 6x = 18
B. 3x = 18
C. 9x = 18
D. 3y = 18

In triangle abc, the length of side ab is 12 cm, the length of side bc is 5 cm, and the length of side ca is 9 cm. find the measure of angle a using the law of cosines.

Astandard deck of cards contains 52 cards. one card is selected from the deck. (a) compute the probability of randomly selecting a seven or king. (b) compute the probability of randomly selecting a seven or king or jack. (c) compute the probability of randomly selecting a queen or spade.

How far could you drive on 50 gallons of gas