Writing Linear Equations

A large aquarium already has 7 gallons of water in it before Becky starts to pour in more to fill the aquarium. She can pour in 3 gallons per minute.Write an equation to model the amount of water in the aquarium after Becky begins filling it up. Starting Value (# of Gallons it started with): 7Rate of Change (# of Gallons poured in per minute): 3Equation: y = 3 x + 7 A local pizza store is offering a deal for multiple large pizzas. The first large pizza is $9 and each additional large pizza is $6.Write an equation modeling the cost of ordering x number of large pizzas. Starting Value (Cost of ordering one pizza):9Rate of Change (Price per additional pizza): 6Equation: y = 6 x + 9 Marta's monthly cell phone bill is $20 plus $5 per gigabyte of data she uses.Write an equation modeling Marta's cell phone costs forx gigabytes of data. Starting Value: 20Rate of Change: 5Equation: y = 5 x + 20 A monthly movie pass costs $25 plus $4 per concession stand snack.Write an equation modeling the cost of a movie pass based on x number of concession snacks. Equation: y = 4 x + 25