[8.AF.12.a] Solve systems 2

What is the solution to this system of equations?

3y = 9

-x = 3

• (3,2)

• (3,3)

• (3,-3)

• (-3,3)

Answer explanation

3y=9 divide by 3 on both sides and y=3

-x=3 divide by negative one or change both signs

can't have negative variable when solving for it

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is the solution to this system of equations?

-3y = 9

-3x = -9

• (3,2)

• (3,3)

• (3,-3)

• (-3,3)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is the solution to this system of equations?

2y = 4

-x = -3

• (3,2)

• (3,3)

• (3,-3)

• (-3,3)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

0.8x + y = -9.6

0.2x - 0.3y = 2

Solve this system . Don't be scared of decimals. Take your time and use desmos

• (-2,-8)

• (2,8)

• (3,-7)

• (-3,7)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

If (r, s) is the solution to the system of equations, what is the value of r?

−8r − 8s = 100

r − 2s = 10

• -25

• 25

• 7.5

• -7.5

Tags

CCSS.HSA.REI.C.9

If (r, s) is the solution to the system of equations, what is the value of s?

−8r − 8s = 100

r − 2s = 10

• -25

• 25

• 7.5

• -7.5

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Which linear system could the graph represent?

• −x + y = 2

  x + 2y = 2

• 4x + 4y = 4

  x + y = 1

• 2x − y = 4

  x + 2y = −3

• x + y = 2

  2x + 2y = 8

Tags

CCSS.8.EE.C.8B

Consider the system of linear equations:

4x + 3y = 3

2x + 9y = 7

Which is a viable first step to solve this linear system using the elimination method to find the value of x first?

• multiplying the second equation by -3

• multiplying the second equation by 2

• multiplying the first equation by -3

• multiplying the first equation by 2

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Consider the system of linear equations:

4x + 3y = 3

2x + 9y = 7

Which is a viable first step to solve this linear system using the elimination method to find the value of x first?

• multiplying the second equation by -3

• multiplying the second equation by -2

• multiplying the first equation by 3

• multiplying the first equation by 2

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Consider this linear system:

3x − 2y = −2

x + 3y = 14

To solve this system by substitution, which expression could be substituted for x?

• −3y + 14

• −3y + -14

• −3y - 14

• 3y − 14

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6