1. one of the equations for one of its variables Example: -x + y = 1
If you can easily isolate one of the variables, use SUBSTITUTION!
STEPS:
SOLVE
SUBSTITUTE
SUBSTITUTE
The values of x and y
CHECK
*Remember: The solution to a system is an ordered pair (x , y) that makes the equation true.
one of the equations for one of its variables
Example:
-x + y = 1
2x + y = -2
the expression from step 1 into the other equation and solve for the other variable
the value from step 2 into the revised equation from step 1 and solve
make the ordered pair solution
the solution in each of the original equations

2.
The length of a rectangle is 3 cm more than twice the width. The perimeter of the rectangle is 42 cm. Find the dimensions of the rectangle.