Review for quiz on systems

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

• (-7,1)
• (2,-5)
• (-2,5)
• (7,-1)

Solve by elimination
-6x + 5y = 1
6x + 4y = -10

• (1,-1)
• (0,-1)
• (1,1)
• (-1,-1)

Solve the system by elimination.  

12x + 36y = −3 
−12x − 36y = 0 

• (10, 1) 
• (−10, −1) 
•  (10, −1) 
•  No solution 

Solve by elimination:
7x-9y=29
7x+2y=-15

• (-4,-1)
• (-1.-4)
• (-1,4)
• (-1,6)

 $3x-2y=12$  

 $2x+2y=-2$  

What variable will eliminate in the system? 

• x

• y

• both

• neither

 $-8x+y=20$  
   $4x-3y=5$  
What does the second equation need multiplied by so that the x's will eliminate?

• 2

• -1

• 4

• 0

7x + 4y = 12

x + 2y = -4

• (-4,4)

• (4,4)

• (4,-4)

• (-4,-4)

Lesly graphed two lines in order to find the solution to a given system of equations.
What is the solution?

• (-3,-8)
• (-8,-3)
• (3,-8)
• (8,3)

^{What is the solution?} 

• 1
• -2
• (1, 2)
• (1, -1)

This system has _____ solutions

• 0
• 1
• 2
• Infinitely many