Illustrative Mathematics Algebra I Unit 6

Which answer has a correct first step for this system:

• The variable is already isolated, so we've already solved the system.

• The variable is already isolated for y, so we substitute it in the first equation and solve for x

  3x + 3(3x + 5) = 3

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• The variable is already isolated for y, so we substitute it in the second equation and solve for x

  y = 3(3x + 3y) = 3

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

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 equation would you use start solving the system of equations using substitution?

• y = 4(-2x+5) - 3

• 4x - 3 = -2x + 5

• y = -2(4x - 3) + 5

• y = (4x - 3) + (-2x + 5)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What equation would you use to start solving this system of equations using substitution.

• 2x + 5 = 2x = 8y

• 2(2x + 5) + 8y = 17

• 2x + 8(2x + 5) = 17

• y = 2(2x + 8y) + 5

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

-4 x -3 will have a positive answer

• true

• false

Tags

CCSS.7.NS.A.2A

CCSS.7.NS.A.2B

-6 x 3

• -18

• 18

Tags

CCSS.7.NS.A.2A

CCSS.7.NS.A.2B

-5c = 20 What is c?

• 4

• 2

• -4

• -100

Tags

CCSS.6.EE.B.7

-6 + v = 10 What is v?

• 16

• 4

• 2

• -4

Tags

CCSS.6.EE.B.7

g + (-8) = -10 What is g?

• -18

• 18

• -2

• 2

Tags

CCSS.6.EE.B.7

Tyler's bank account has a balance of -30 dollars. Tyler makes 3 withdrawals of $7 each. What is his new balance?

• -37

• -51

• -23

• -21

Tags

CCSS.7.NS.A.3