Lesson 21 Solve One Variable Equations

After 4 students joined a class, the class has 32 students. Which equation can be used to find n, the number of students in the class before the new 4 students joined?

• n - 4 = 32

• 4n = 32

• n + 4 = 32

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CCSS.6.EE.B.6

CCSS.6.EE.B.7

• F

• G

• H

• J

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CCSS.6.EE.B.5

CCSS.6.EE.B.6

What is the solution to the following equation?

• x = 8

• x = 16

• x = 4

• x = 6

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CCSS.6.EE.A.2

CCSS.6.EE.B.5

CCSS.6.EE.B.6

CCSS.6.EE.B.7

Find the solution of the following equation.

• x = 5

• x = 3

• x = 7

• x = 10

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CCSS.6.EE.B.5

CCSS.6.EE.B.6

Ted bought a dolphin poster for $12. He now has $5. Write and solve an equation to find out how much money Ted took to the aquarium.

• m - 12 = 5

• m - 5 = 12

• m + 5 = 12

• m + 12 = 5

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CCSS.6.EE.B.5

CCSS.6.EE.B.6

CCSS.6.EE.B.7

Sergio got a paycheck for $74.80 for

10 hours of work. Which equation can be

used to find x, the amount he was paid

per hour?

• x + 10 = 74.80

• x − 80 = 74.80

• 10x = 74.80

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CCSS.6.EE.B.6

CCSS.6.EE.B.7

CCSS.6.EE.C.9

CCSS.6.RP.A.2

CCSS.6.RP.A.3

Solve the following equation
X + 8 = 15

• 23
• -7
• 7
• -23

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CCSS.6.EE.B.5

CCSS.6.EE.B.6

CCSS.6.EE.B.7

Solve the following equation 
8 = m - 12

• 4
• 0.5
• 5.0
• 20

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CCSS.6.EE.A.2

CCSS.6.EE.B.5

CCSS.6.EE.B.6

CCSS.6.EE.B.7

Solve the following equation
2y = 18

• 36
• 16
• 9
• 20

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CCSS.6.EE.B.5

CCSS.6.EE.B.6

CCSS.6.EE.B.7

Which choice models this situation? Marcus needs to sell 25 tickets to a fundraiser by Friday. So far, he has sold 9 tickets. How many tickets does he still need to sell?

• t - 9 = 25

• t + 9 = 25

• 9t = 25

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CCSS.6.EE.B.6

CCSS.6.EE.B.7