Please can someone solve

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

Margaret is purchasing a house for $210,000 with a 15 year fixed rate mortgage at 4.75% interest she has made a 5% down payment the house is valued at 205,000 and the local tax rate is 3.5% homeowners insurance 600 per year what are her total monthly payment

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?