Math 8 Feb 4

Math 8

February 4, 2021

Vertical Line Test

On a graph, the idea of single valued means that no vertical line ever crosses more than one value.

If it crosses more than once it is still a valid curve, but is not a function.

Multiple Select

Five input/output tables are shown. Select all the tables that model functions.

Multiple Choice

Which graph is not a function?

Multiple Choice

Which is an equation of the line graphed?

• $y=-4x+\frac{2}{3}$

• $y=\frac{2}{3}x-4$

• $y=\frac{3}{2}x-4$

• $y=4x-\frac{2}{3}$

Multiple Choice

Triangle PQR was reflected across the y-axis resulting in the triangle. What were the coordinates of pre-image point Q?

• $\left(-4,3\right)$

• $\left(-3,4\right)$

• $\left(3,-4\right)$

• $\left(4,-3\right)$

Multiple Choice

The graph shows the relationship between the height of a ball (in meters), y, thrown into the air and the time (in seconds), x. Which statement best describes the height of the ball?

• The maximum height is 2 meters.

• The maximum height is 4 meters.

• The height is increasing for 2 seconds.

• The height is increasing for 4 seconds.

Multiple Choice

Albert had $120 in his savings account of the first day of the year. He deposited some money at the end of January and decided to deposit the same amount at the end of every month. Albert has $300 in his account after 3 months. Which equation represents his savings, y, after x months.

• $y=100x$

• $y=60x+120$

• $y=100x+120$

• $y=120x+60$

Multiple Choice

Which equation models the linear relationship in the table below?

• $y=-3x-2$

• $y=-3x-22$

• $y=3x-2$

• $y=3x+22$

Multiple Choice

Linda's online used book store charges $5.00 per paperback book, plus $7.00 for shipping. Barbara's online used book store charges based on this table. Which store charges more for shipping and how much more does that store charge?

• Linda's online used book store charges $1.50 more for shipping.

• Linda's online used book store charges $3.00 more for shipping.

• Barbara's online used book store charges $3.00 more for shipping.

• Barbara's online used book store charges $3.50 more for shipping.

Multiple Choice

Josh and Lindsay walk dogs to earn money. They each charge an initial fee to visit a house and then a charge for walking x number of dogs. Josh uses the equation  $y=5x+20$  to calculate the total charge, y, for walking x dogs. Lindsay uses this chart. Which statement is true?

• Lindsay charges $5 more than Josh for the initial fee.

• Lindsay charges $7 more than Josh for the initial fee.

• Josh charges $5 more than Lindsay for the initial fee.

• Josh charges $7 more than Lindsay for the initial fee.