Solve by substitution. Please show work!!!
x+4y=-3
x+7y=-12

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:

Which of the following is the best first step in solving the equation below? 4+2㏒³x=17

Using elimination, what is -4x+2y=-12 4x+8y=-24