Supermarket

[nycmath]

Rita went to the supermarket to buy 5 items.

Items...............................Price

2-liter soda......................$4.50
1 gallon of water.............$2.99
1 large bag of chips........&3.50
1 bag of sliced bread......$4.19
1 gallon of milk..................x

If the total was $20.25, what is the price for a gallon of milk?

[Eigenvalue]

x+4.5+2.99+3.5+4.19=20.25

x+8+7.2-0.02=20.25

x=20.25-15.2-0.02

x=8.05-0.02=8.03

[nycmath]

x+4.5+2.99+3.5+4.19=20.25

x+8+7.2-0.02=20.25

x=20.25-15.2-0.02

x=8.05-0.02=8.03

A simple example of a linear equation in real-life.