Tables, Equations, and Graphs

Which equation matches the table?

• y = 3x + 9

• y = x + 9 

• y = x + 3

• y = 12x - 3

Which equation matches the description if x is the number of minutes and y is the total cost.

• y = 1.20

• y= 1.20x

• x = 1.20

• x = 1.20y

Which is the graph of y= -x + 2?

• A

• B

• C

• D

A phone company charges a sign-up fee of $3.50, plus $x for every hour the phone is used. If Brian talked on the phone for 12 hours and paid a total of $75.50, which of the following equations can be used to find, x, the hourly rate of the phone plan?

• 3.50 + x = 75.50 

• 3.50 - x = 75.50 

• 75.50 + 12x = 3.50 

• 3.50 + 12x = 75.50

• 3.5

• 4

• 4.5

• 5

Answer explanation

To find the missing value of x, notice the pattern that f(x) increases by 3 each time x increases by 1. Therefore, when f(x) = 10, x must be 4.

Which graph represents the table?

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Nadea has $600 in her savings account. She withdraws $35 per week to buy gas for her car. Which equation can be used to determine how many weeks, w, it will take for Nadea to reduce her balance to $285?

• (600 – 35)w = 285

• 35w – 600 = 285

• 600 – w = 285

• 600 – 35w = 285

Write the equation of the line.

• y= -1x-3

• y= -3x-1

• y=(-1/3)x-1

• y= -3x-3

Write the equation.

• y = 4x + 3

• y = 4x -3

• y = 3x + 4

• y = 8x + 2