Solve the system by substitution. check your answer.
3x + 5y = 4
x=3y + 6

Three coins are flipped. what is the probability that there will be at least two tails?

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?