Systems of Equation and Inequalities Unit test

The solution (x, y) to a system of equations is the point where they...? 

• Run off the graph
• Don't touch
• Intersect
• Exist

Tags

CCSS.8.EE.C.8B

What is the solution?

• (1, -1)
• (-1, 1)
• (0, -2)
• (2, 0)

Tags

CCSS.8.EE.C.8B

What is the solution?

• (6, 3)
• (3, 6)
• (-6, 3)
• No solution

Tags

CCSS.8.EE.C.8A

Solve by Substitution:

y = -6

-3x - 6y = 24

• (6, 6)

• (6, -6)

• (4, -6)

• (-6, 4)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve by Substitution:

y=3x+14

y=-4x

• (2,-8)

• (-14,56)

• (-2,8)

• (8,-2)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve this system of equations, step by step.
-2x - 8y = 10
2x - 6y = 18
What is the result if you add these equations together?

• 4x - 14y = 28
• 14y = 28
• 2y = 8
• -14y = 28

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

When you added the system, the result was 
      -14y = 28
Now, solve for y.
   

• y = -2
• y = 2
• y = -7
• y = 7

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Now we know y= -2.  Substitute into both equations to find x.
-2x - 8y = 10
2x - 6y = 18

• x = - 3
• x = 3
• x = 13
• x = 15

Tags

CCSS.HSA.REI.C.9

-2x - 8y = 10
2x - 6y = 18
y = -2 and x = 3
Write the solution for the system of equations

• y = -2 
• x = 3
• (-2, 3)
• (3, -2)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve this system of equations, step by step.
-5x - 4y = -15
 -x + 4y = -3
What is the result if you add these equations together?

• -4 x = - 12
• -4x = 12
• -6x = -18
• -6x = 18

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6