System of Equations
Substitution - 500
It's best to use substitution when the coefficient of any variable is 1.
Graphing - 500
Word Problems - 500
(x+4y=63 and x+6y=87) Now, just choose your method. Since the 'x's are the same, I'm going to use elimination.
Write a System - 500
The 3 types of Solutions
Take for example, y=5x-2 and y=5x+4 . They have the same slope a different y-int. They will never cross. They are parallel. This is a no solution.