Goal
Calculate one variable with the other variable
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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