Common Core Math 8.ee.8b
Expressions And Equations: Analyze And Solve Linear Equations And Pairs Of Simultaneous Linear Equations.
Solve systems of two linear equations in two variables algebraically, and estimate solutions by graphing the equations. Solve simple cases by inspection. For example, 3x + 2y = 5 and 3x + 2y = 6 have no solution because 3x + 2y cannot simultaneously be 5 and 6.