Substitution
Elimination
Substitution equations
Elimination equations
100

How do you solve a Substitution problem?

What is solving for a variable then replacing the next variable with the known value?

100
Can you add the same value to each side of an equation?
What is yes
100

x+y=10

x-y=2

What is (-4,6)

100

2x+3y=20

-2x+y=4

What is (1,6)

200
What does substitute mean?
What is to put in the place of another?
200
Is it possible to eliminate both variables? what happens?
What is yes, you end up with either a true or false statement
200

3y-2x=11

y+2x=9

What is (2,5)

200

Solve by using elimination. 

3x-y=5 

x+y=3

What is (1,-2)

300
what are you looking for in solving?
What is the point where the lines intersect?
300
The elimination method can also be called what?
What is the addition method?
300

2x+3y=5

y+2x=7

What is (4,-1)

300

2x-5y=11

3x+2y=7

What is (3,-1)

400
what equation do you HAVE to start with?
What is either one
400
What equation do you HAVE to start off with?
What is either one
400

4+y=-3x

2y+6x=-8

infinitely many solutions

400

y-2x=3

y-2x=-3

No solution

500

What do you do after you have solved for the first variable?

What is substitue it in to the next equation

500
Instead of multiplying one equation to eliminate a variable when the equations were added, what could you have done?
What is multiply both equations by different numbers
500

y=5x+3

y=-8x+16

What is (1,8)

500

3x-4y=-5

5x-2y=-6

What is (-1,1/2)

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