Pat is three times older than her dog. 4 years ago she was 7 times older. How old is pats dog? Please explain in elimination and substitution! Please soon I have a test tomorrow and I don’t get it ! I will give you all points and brainliest

Griffin ordered a pair of sneakers online. he had a $22 credit that he applied toward the purchase, and then he used a credit card to pay for the rest of the cost. if the shoes cost $58, how much did griffin charge to his credit card when he bought the sneakers?