Spiral Review

What is the y-intercept of the line graphed?

(a)  

Answer explanation

The y-intercept is where the line crosses the y-axis.

What is the y-intercept for this linear table?

• (-2,-6)

• (-1,4)

• (0,2)

• (1,0)

• (2,-2)

Answer explanation

In a table, you can find the y-intercept by looking for where x=0.

What is the slope of the graphed line?

(a)  

Answer explanation

1) Find two "nice points" and make a triangle

2) divide the vertical change by the horizontal change, (vertical = | , horizontal = ---)

3) check increasing or decreasing. Increasing is positive, decreasing is negative

Tags

CCSS.8.EE.B.5

What is the slope of the table?

(a)  

Answer explanation

To find the slope of a table, you need to find Δy and Δx. Remember Δ means change. So you find how y changes (-2) and how x changes (+1). Then slope is Δy/Δx. In this case, that is -2/1 = -2

Tags

CCSS.8.EE.B.5

What is the equation of the graphed line?

(a)  

Answer explanation

The slope is 3 and the y-intercept is -1. Now we plug in those values into the formula y = mx + b. m= slope, b= y-intercept.

So y = 3x - 1

Write a linear equation that represents the linear function seen in the table?

(a)  

Answer explanation

Once you have the slope and the y-intercept, you plug them into the formula y = mx + b.

m = -2 , b = 2

y= -2x + 2

Tags

CCSS.8.F.B.4

CCSS.HSF.LE.A.2