Pythagorean theorem question:)

Which is the graph of the function y=2(4)^x

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

Julie goes to the sports store and spends $40.50 before tax. she buys a pair of shorts for $21.75 and 3 pairs of socks that each cost the same amount. how much does each pair of socks cost? $$