8th grade Math, 1st semester review skills.

Linear Equations

100

Find the Y-intercept given the points

(0, 7), (9, 8)

B=7

200

Find the Y-intercept given the points

{(7, 8), (5, 12), (3, 16), (1, 20) (0, 22)}

B=22

300

What is the slope of a line given it passes through the points

{(3, 6), (6, 15)}

M=3

400

What is the slope of a line given it passes through the points {(2.5, 8), (5.5, 9)}

M=1/3

500

Put the following into Y=MX+B format. 

Find the slope of the line given it passes through the points (0, -13) and (-9, -16) . 

Y=-1/3x-13

Vocabulary

100

Y2-Y1 

X2-X1

Slope point formula

200

Shown as a straight horizontal line on a graph

Zero Slope

300

A rule for what order we should solve an equation. 

The Order of Operations

400

An equation in which variables cancel out, leaving two different numbers on either side of the equal sign. 

No solution

500

An equation in which variables cancel out, leaving the same number on both side of the equation. 

Infinite solutions

Clayton's Calculations

100

X-3=5

8

200

5x-8=12

X=4

300

4x-9=3x+12

X=21

400

4²+11x=3³

X=1

500

5(x+7)-(4x+30)=8x+26

X=-3

Order of operations

100

4-3+6

7

200

4*2-6

2

300

6/3-3*6

-16

400

7²-5²

24

500

3(4-5)-3²+5(2+1)

27

Mystery

100

Find the area of a square if one side is 3cm in length

9cm²

200

Find the perimeter of a rectangle given one length is 5ft, and another side is 8ft. 

26ft

300

From the concession stand at a football game, Blake and crew purchased a jumbo bag of popcorn for $2.50 and 3 drinks.  The total cost was $12.25.  Write an equation to model this situation.  Then solve to find the cost of each drink.

3D+2.50=12.25

Each Drink = 3.25

400

Amber has $300 in her bank account and she deposits $40 each month.  Lexie has $600 in her bank account and she deposits $15 each month.  When will they both have the same balance?  How much will they have at that time?

12 months and $780

500

The school book club ordered t-shirts for a fundraiser. The shirts cost $260.  The book club also paid $2 per shirt to have their logo printed.  They plan on selling the shirts for $15 each.  How many shirts will they need to sell before they start earning a profit?

20 shirts