Goal

1. Calculate one variable with the other variable
2. Evaluate expressions

How to Solve Linear Equations in 2 Variables

Situation 1: Directly Solve

Method: Plug that value into the equation and solve for the remaining variable.

If 2x+3y=2 and x=3, what is the value of y ?

If 4x - 3y = 10 and y = 2, what is the value of x?

Situation 2: Solve for the Unknown Variable

Method: Simplify the equation and solve for the other variable.

If 2x+1=5, what is the value of 8x+4 ?

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