Systems Review

Solve by elimination:
4x + 9y = 28
-4x - y = -28

• (-7,0)
• (6,0)
• (-6,0)
• (7,0)

Solve by elimination

-6x + 5y = 1

6x + 4y = -10

• (-1,7/5)

• (0,-1)

• (1,1)

• (-1,-1)

Solve by elimination:
-9x - 4y = -20
5x + 4y = 4

• (-4,4)
• (4,4)
• (4,-4)
• (-4,-4)

What would be the first step in finding the solution with elimination?

4x + 3y = 1

x - 3y = -11

• cross out the 3y and -3y

• cross out the 4x and x

• change all the signs of the second equation

• add 1 and -11

7x - y = 10

-7x + y = -14

• No Solution

• (4, 1)

• Infinitely Many Solutions

• (2, -4)

What is the solution to the system?

• (0, 3)
• (1, -1)
• (-3, 1)
• (1, 3)

When you graph the exact same equation twice,

• you will have no solution. 
• you will have one solution.
• you will have infinite solutions. 
• you will graph a giraffe. 

This system has _____ solutions

• 0
• 1
• 2
• Infinitely many

Solve the systems by substitution:

x = 4

-2x + 3y = -2

• (4, 6)

• (4, 4)

• (4, 2)

• 2, 4)

Solve the systems by substitution:

x = 3

x + y = 8

• (5, 3)

• (-5, 3)

• (3, 5)

• (3, -5)