7th grade equations/inequalities

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A monthly budget for a small family is shown.

Which equation can be used to find b, the minimum amount of money the family must earn annually in order to meet this budget?

• b = $3,630 x 12

• b = $3,630 x 52

Mathematical Equivalence

ON

Olivia has a job putting letters in envelopes to be mailed. In 1 hour she put 42 letters in envelopes. Which equation best represents y, the total number of letters Olivia puts in envelopes in x hours if she continues at this rate?

• x = y + 42

• y = x + 42

• x = 42y

• y = 42x

George started a coin collection. His dad gave him 75 coins. Each month he will add 20 coins to the collection.

Which equation can be used to find y, the total number of coins in George's collection after x months?

• y = 75x+ 20

• y = 20x + 75

• y = 75x - 20

• y = 20x - 75

What equation would represent this model?

​ (a)  

What is the solution to this equation x = (b)  

• 3x + 6 = 9
• 1
• 3x - 6 = 9
• 3x = 9
• -3x + 6 = 9
• 2
• 3
• 4
• 2x + 7 = 9

• A

• B

• C

• D

Pizzazz Publications is having some books printed. The printer charges $800 plus $5 per book. What equation could help me find how many books can be printed for $4,000?

• 800 + 5x = 4000
• 800x + 5 = 4000
• 4000 + 5x= 800
• 800 + 5 = 4000