Unit 3 Test Practice

Select which of the points is NOT on the graph of the line 2x + 5y = 30 (hint: you have to do the math to check these!)

• (0,6)

• (15,0)

• (5,4)

• (6,0)

The graphs represent the temperatures of four different cities recorded over time. According to the different lines graphed, which do you think is TRUE? (think how y=mx+b works)

• City c's temperature starts off more than City a

• The temperature in City d increases over time

• The temperature in City b decreases over time.

• City b's temperature rose faster than City a

Alexis earns three times as much money as Aidan. Aidan earns twice as much money as Natalie. Which graph could represent the situation?

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Write an equation for the RED line. (remember: y=mx+b where m is the slope, and b is the y-intercept)

• y = 2x + 2

• x = 3 (vertical line)

• y = -2 (horizontal line)

• y = -x

Write an equation for the BLUE line. (remember: y=mx+b where m is the slope, and b is the y-intercept)

• y = 2x + 2

• x = 3 (vertical line)

• y = -2 (horizontal line)

• y = -x

Write an equation for the GREEN line. (remember: y=mx+b where m is the slope, and b is the y-intercept)

• y = 2x + 2

• x = 3 (vertical line)

• y = -2 (horizontal line)

• y = -x

Write an equation for the BLACK line. (remember: y=mx+b where m is the slope, and b is the y-intercept)

• y = 2x + 2

• x = 3 (vertical line)

• y = -2 (horizontal line)

• y = -x

It costs $0.75 to download a song and $5 to download an album. Jada has $25 dollars to spend downloading music. Which equation represents this situation, if x = number of songs, and y = number of albums??

• 25 = 0.75x + 5y

• 25 = 5.75xy

• 25 = 0.75y + 5x

• 25 = x + y

It costs $0.75 to download a song and $3 to download an album. Jada has $25 dollars to spend downloading music. Use the equation 25 = 0.75x + 3y... Which ordered pair fits the situation correctly, if x = number of songs, and y = number of albums?

• (1, 1)

• (4, 7)

• (8, 2)

• (3, 3)

Mrs. Lamontagne's cell phone plan costs $150 to start. Then, there is a $25 charge each month.

a) What is the TOTAL cost to use the cell phone plan for 1 month?

• $150

• $175

• $25

• $200