13. Gasoline costs $2.50 per gallon. If you have $30 in your wallet, do you have enough to buy 15 gallons of gas? Write an equation and prove your
answer. Show all work.

No

Step-by-step explanation:

You have $30

Gas is $2.50

You need 15 gallons.

So to show how much you need for gas you would write this equation:

30= 2.5x

To solve:

30/2.5 = 2.5x/2.5

12 = x

x is the amount of gallons you will recieve.

u = -(6/7)w

step-by-step explanation:

place all values with 'u' on one side of the equation.

4u + 8w = - 3u + 2w

4u + 3u = 2w - 8w

further simplify the equation by solving the addition and subtraction.

7u = - 6w

make 'u' the independent variable by placing its co-efficient on the right-hand side.

u = - (6/7)w