1. Ch. 6 Vocabulary
7.) Substitution method (6-2) 8.) Elimination method (6-3)

2. 6-2 Solving Systems by Substitution
Algebra 1

3. Substitution Steps
1.) Solve one equation for one of the variables which has a coefficient of 1 or
-1.
2.) Then substitute your result from #1 into the other equation and solve for a variable.
3.) Then substitute your result from #2 into the first original equation.
4.) Your solution should be written as an ordered pair, (x,y).

4. Example 1
y= 2 + x
2x + 5y = -11
(-3,-1)

5. Example 2
x + y=6
3x + y=15
(9/2, 3/2)

6. Ex. 3 Try this one!
y – 2x =3
3x -2y = 5
(-11,-19)

7. Example 4
x = 3y - 4
6y = 2x + 8
Infinitely Many ( same slope, same y-intercept therefore same line)

8. Example 5
y = 2x + 1
4x – 2y = 6
No Solution