Test on Writing and Solving Equations Word Problems

4x = 16

• Expression

• Equation

• Inequality

Write an expression. 
Anita needs at least an 90 grade (g) on her test to get an A in math class.

• g ≤ 90

• g ≥ 90

• g < 90

• g > 90

There were many _________ that I solved for homework.

• sentences

• answers

• equations

• examples

When solving Algebraic Equations, in order to isolate a variable, you must use:

• Order of Operations

• Inverse Operations

• Algebraic Expressions

• Order of Operations

Write an equation to represent the situation; then solve.

Damian is monitoring the temperature of the swimming pool. It is currently 86.8° and cooling 0.5° per minute. After how many minutes will the swimming pool be 80.8°?

Equation: ​ ​ (a)  

Solution: ​ ​ (b)  

• 86.8 - 0.5x = 80.8

• 0.5x - 86.8 = 80.8

• 86.8 + 0.5x = 80.8

• 0.5x + 86.8 - 80.8

• 335 minutes

• -12 minutes

• -335 minutes

• 12 minutes

#1 Hello World

• # of tickets

• # of hours

This problem:

• gives you a rate of change (slope) and a starting point (y-intercept)

• relates two different objects

• gives you a rate of change (slope) and a sample point (x,y)

• amount of money
• number of days

Eddie ordered customized cups. He was charged a $30 design fee plus $8 per cup. His total order was $334. How many cups did Eddie order?

• 30 + 8x = 334

• 30x + 8 = 334

• 8x - 30 = 334

• 30 - 8x = 334

• 38 cups

• 45 cups

• 32 cups

• 45.5 cups

You want to buy a new gaming system that cost $500. You have already saved up $225. If you save 20 bucks each week, how many weeks before you have enough for a new phone?

• 225 + 20x = 500

• 225x + 20 = 500

• 20x + 500 = 225