Unit 1C CFA

The solution (answer) to a system of equations is ____________

• the point where the 2 lines intersect

• the graph of a line

• only finding what x = __

Tags

CCSS.8.EE.C.8B

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

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

A ________________ are two or more equations that have the same variables and work together.

• graphing lines

• elimination method

• system of equations

• table

• slope intercept form

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

to use elimination method both equations are.......

• slope intercept form

• standard form

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

what do you need to multiply the top equation by to make a zero pair:

5x - 2y = 11

-10x + 3y = -4

• 5

• -1

• 2

• -2

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Gabby and Sydney bought some pens and pencils. Gabby bought 4 pens and 5 pencils for $6.71. Sydney bought 5 pens and 3 pencils for $7.12. Find the cost of each.

Select the two choices below that define your variables.

• x = the cost of a pen

• y = the cost of a pencil

• x = 9 pens

• y = 8 pencils

Tags

CCSS.8.EE.C.8C

Gabby and Sydney bought some pens and pencils. Gabby bought 4 pens and 5 pencils for $6.71. Sydney bought 5 pens and 3 pencils for $7.12. Find the cost of each.

• The cost of a pen is $1.19 and the cost of a pencil is $0.39.

• The cost of a pencil is $1.19 and the cost of a pen is $0.39.

• The cost of a pen is $6.71 and the cost of a pencil is $7.12.

• The cost of a pen is $7.12 and the cost of a pencil is $6.71.

Tags

CCSS.8.EE.C.8C

Mary has a collection of nickels and quarters for a total value of $4.90. If she has 42 coins total, how many of each kind are there?

Select the two choices below that define your variables.

• x = number of quarters

• y = number of nickels

• x = 42 coins

• y = $4.90

Tags

CCSS.8.EE.C.8C

Mary has a collection of nickels and quarters for a total value of $4.90. If she has 42 coins total, how many of each kind are there?

• Mary has 28 nickels and 14 quarters.

• Mary has 14 nickels and 28 quarters.

• Mary has $4.90.

• Mary has 42 coins.

Tags

CCSS.4.MD.A.2

Solve the system by elimination.

−4x − 4y = 0

4x + 4y = 0

• (−6, −4)

• Infinite number of solutions

• No Solution

• (6, 4)

• (0,0)

Tags

CCSS.8.EE.C.8B