Solve the following system of equations. plz explain
-3x + 4y =64
x + 4y = 48
a. x = 8, y = 10
b x = -4, y = 13
c. x = 13, y = -4
d. x = 2, y = 17.5

The probability that an adult possesses a credit card is .70. a researcher selects two adults at random. by assuming the independence, the probability that the first adult possesses a credit card and the second adult does not possess a credit card is: