Combining like terms is a mathematical process used to simplify an expression. Looking at each individual side of an equation you can combine coefficients and variables by adding or subtracting them to simplify that sides expression. You can not combine like terms across the equal sign.
Distance = Rate * Time. A bus and a car leave the same place and traveled in opposite directions. If the bus is traveling at 50 mph and the car is traveling at 55 mph, in how many hours will they be 210 miles apart?
John has a board that is 60 inches long. He plans to use it to make 4 shelves whose lengths are to be a series of consecutive even numbers. How long should each shelf be in inches?
Let x = length of first shelf, x+2 =second shelf, x+4 =third shelf, x+6 =fourth shelf. 4x+12=60, x=12,14,16,18