Abathtub that holds 43 gallons of water contains 18 gallons of water. you begin filling it, and after 5 minutes, the tub is full. enter an equation in standard form to model the linear situation.

The tub holds 43 gallonsit contains 18(43 - 18) = 25so it needs 25 gallonsafter 5 minutes, the tub is fullso it fills at a rate of 25/5 = 5 gallons per minute

y = 5x + 18where y is the total gallons and x is the number of minutes
but we need it in standard form

y = 5x + 18
-5x + y = 18
5x - y = -18 <== standard form