Math 8 Expressions and Equations II CAASPP Review

Calculate the slope of the line of best fit, based on the given data points in the chart.

Mathematical Equivalence

ON

The y-intercept of the estimated line of best fit is at (0, b). Enter the approximate value of b.

Mathematical Equivalence

ON

Sam is comparing two local fitness centers to determine which one to join:

Fitness Center A; $30 joining fee and $35 monthly charge.

Fitness Center B: No joining fee and $40 monthly charge.

After how many months will the total cost of membership be the same at both fitness centers?

• 6 months

• 10 months

• 3 months

• 5 months

Select the statement that correctly describes the solution to this system of equations. 3x - 2y = 5 6x + y = 13

• There is no solution.

• There are infinitely many solutions.

• There is exactly one solution at (2,3).

• There is exactly one solution at (3,2).

The head of the math department wants to order custom calculators with the school logo for an upcoming competition. - The calculators can be purchased from Supplier A for $1.25 each, with no additional shipping costs. - The calculators can be purchased from Supplier B for $1.20 each, plus $5.50 for shipping. Which statement is accurate regarding the purchase of calculators from these suppliers?

• Only the cost model for Supplier A results in a linear graph.

• The cost function graphs for both suppliers will never cross each other.

• Purchasing calculators from Supplier B is always more costly than purchasing from Supplier A, no matter the quantity ordered.

• The more cost-effective supplier depends on the total number of calculators ordered.

Select the statement that correctly describes the solution to this system of equations. 2x - y = 4 y = 2x - 6

• There is no solution.

• There are infinitely many solutions.

• There is exactly one solution at (1, 2).

• There is exactly one solution at (2, 2).

A system of two linear equations has infinitely many solutions. One equation is 3x + y = 5. Select the equation that would make this system have infinitely many solutions.

• 3x + y = 7

• y - 3x = -5

• 6x + 2y = 10

• x + 3y = 1

This scatter plot shows the relationship between the number and temperature of hot coco sold at Cassie's Cafe. The y-intercept of the estimated line of best fit is at (0, b). Please use the graph to find the y- intercept and slope to fill in slope intercept form below.

Enter the y coordinate of the solution to this system of equations:

2x + 3y = 5

2x + 6y = 8

​ (a)   ​

• 1
• -1
• 0
• -3

For each value of a, determine how many solutions would result for the linear equation 2x+6 = a.

• Exactly one solution

• No solution

• Infinitely many solutions