Linear Equations/Direct Variation

A

100

What is a function whose graph forms a straight line called?

Linear Equation

200

What is the x-coordinate of the point where the graph intersects the x axis called?

x - intercept

300

What is the slope of a horizontal line?

Zero

400

What is the slope of a vertical line?

undefined

500

If y varies directly as x and y = 18 when x = 3, Find y when x = 7

42

B

100

Find the slope of (4,-2) and(-1,2)

-4/5

200

Find the slope of (20,3000) and (60,2000)

-25

300

Find the slope of the equation: y = 25

Zero

400

Which equation has a line that would pass through both (8, 5) and (9, −1)?

y= -6x + 53

500

If y vaires directly with x and y= 12 when x= 15. What is the value of x when y= 16?

20

C

100

Write the linear equation that is solved by both (−6, 2) and (0, 4):

y= 1/3x + 4 

200

What is the slope intercept form? 

y = mx + b

300

Write the equation in slope intercept form: slope=0, y intercept =-5

y = -5

400

Which of the following is the equation format for direct variation?

y = kx

500

In a direct variation, y=39 when x=3.  Find the value of y when x=2

26

D

100

what does the m stand for in y= mx + b

slope

200

what does the k stand for in y = kx

slope

300

What type of relationship is a direct variation?

Proportional

400

What is the equation to find "k"?

k = y/x

500

If y varies directly as x and y = 18 when x = 3, Find y when x = 7

42