Check In: Writing Equations

Julissa has 25 dollars.  She is going to buy a bag of Twizzlers that costs $3.50.  She wants to spend the rest of her money on gum that costs $4.50 per package. Which equation can be used to find out how many packages of gum she can purchase?

• 3.50x + 4.50 = 25

• 3.50x + 25 = 4.50

• 4.50x + 3.50 = 25

• 4.50x + 25 = 3.50

Ash fills his book bag with 5 binders. The weight of the bag and books is 17 pounds! The empty book bag weighs 3 pounds. How many pounds is each book? To solve the problem, he writes the equation:

5x + 3 = 17.

Match each part of the problem with the expression it represents.

• The weight of all of the books.

• 17

• The weight of an empty book bag.

• x

• The weight of each book.

• 5x

• The weight of the book bag and books.

• • 3

Noah is saving money to buy a snowboard that costs $225. He already has $45 and can earn the rest by walking ten dogs. If d represents how much he earns for walking each dog, write an equation that can be solved to find how much Noah is paid for walking each dog.

​ ​ ​ (a)   = ​ (b)   +​ (c)  

• 225
• 10d
• 45
• 45d
• 225d
• 10
• d

Miabella bought a sweatshirt for $25, a pair of jeans for $50, and four t-shirts. She spent a total of $109. Write and solve an equation to find the cost of each t-shirt.

​ (a)   ​ ​ (b)   ​ ​​ ​ (c)   ​ ​ = ​ ​ (d)  

• - 4x
• 25x
• -50
• x
• 25
• + 50
• 109
• + 4x
• 79

Kumail and James decide to go into business making Buddy Band bracelets. To start making the ​bracelets, they purchase supplies for $60. They sell the bracelets for $5 each. Write an equation that can be used to find the number of buddy bands they need to sell to make a profit of $200.

​ (a)   ​ (b)   ​ (c)   ​ ​ = ​ ​ (d)  

• - 5x
• +
• 60x
• 260
• 5x
• 200
• -
• 55x
• 60

The perimeter of the rectangle is 80 inches. SELECT ALL equations that can be used to find the value of x.

• x + 3x - 2 = 80

• x(3x - 2) = 80

• x + 3x - 2 + x + 3x - 2 = 80

• 2(3x - 2) + 2x = 80

If the angles in a triangle add to 180 degrees, what is the value of x?

Mathematical Equivalence

ON

Tags

CCSS.7.EE.B.3

CCSS.7.EE.B.4

CCSS.7.G.B.5