STAAR Review - Writing Equations

Writing Equations with Variables on Both Sides

Write an equation from the real-world scenario or algebra tiles.

Math Response

Write an equation that represents the algebra tiles.

Type answer here

Correct Answer: -3x+7=16

Deg^°

Rad

Math Response

Maria wants to buy a trophy and engrave her son's name on it. At Trophies Unlimited, trophies cost $12 and engraving costs $0.40 per letter, while at Centerpiece Trophies, trophies are $12.50 and engraving is $0.30 per letter. If Maria's costs would be the same at both stores, which equation shows the number of letters, x, in her son's name?

Type answer here

Correct Answer: 12+0.40x=12.50+0.30x

Deg^°

Rad

Math Response

Write an equation that represents the algebra tiles.

Type answer here

Correct Answer: -5x+12=3x-8

Deg^°

Rad

Math Response

Brittany lights a 15-inch candle and an 18-inch candle when her watch shows 1 a.m. The 15-inch candle burns 0.2 inch every hour, and the 18-inch candle burns 0.5 inch every hour. Which equation can be used to find the time, t, on Brittany's watch when the candles are the same height?

**Use the correct variable, t, in your equation.

Type answer here

Correct Answer: 15-0.2t=18-0.5t

Deg^°

Rad

Math Response

Write an equation that represents the algebra tiles.

Type answer here

Correct Answer: 3x+2=4x-3

Deg^°

Rad

Math Response

A container has 300 liters of water, and a second container has 700 liters of water. The first container begins filling up at a rate of 5 liters per minute at the same time the second starts draining at a rate of 6 liters per minute. Which equation can be used to find the number of minutes, x, that elapse before the two containers have the same amount of water?

Type answer here

Correct Answer: 300+5x=700-6x

Deg^°

Rad

Math Response

Write an equation that represents the algebra tiles.

Type answer here

Correct Answer: 2x+3=15

Deg^°

Rad

Multiple Choice

Determine if the equation, 12 + 17x = 20x, represents the story.

Steven is going to buy pizzas tonight. Domino's charges $12 per pizza, and there is a $17 delivery charge. Papa John's charges $20 per pizza with no other charges. What is x, the number of pizza's ordered for the total cost of both restaurants to be the same?

• True

• False