Substitution and Elimination

• x

• y

• both

• neither

• 5

• 0

• -1

• 2

• (0, -4)

• (2, 4)

• No solution 

• (2, 0)

9x+3y=-15

-18x-6y=30

• No Solutions

• One solution

• Infinitely many solutions

• Elimination

3x-6y=7

2x+6y=8

• (3,3)

• (-3,-3)

• (3,1/3)

• (-1/3,3)

4y-3x=20

y=4

• (-4/3,4)

• (-4,4)

• x=-4/3

• y=4

Solve using elimination. 
 4x + 8y = 20
-4x + 2y = -30

• (-7,1)
• (2,-5)
• (-2,5)
• (7,-1)

Solve the system of Equation (x,y)
3x + 2y = –13
3x + 4y = 1 

• (-9,7)
• (7,-9)
• (4,-7)
• (-7,-4)

• x

• y

• both

• neither