Identify Linear Equation Forms

Which equation represents the line graphed? (Click on the image to enlarge)

• y = -x + 18 

• y = x + 18

• y = -2x + 18

• y = -18x + 9 

What equation represents this graph? (Click on the image to enlarge)

• y = 60x

• y = 40x

• y = 80x

• y = 20x

What is the equation of the line graphed? (Click on the image to enlarge)

• y = 3x

• y = x - 3

• y = x + 3

• y = x

Write the equation of the line. (Click on the image to enlarge)

• y= -1x-3

• y= -3x-1

• y=-1/3x-1

• y= -3x-3

A fitness club opens with 80 members. Each month the membership increases by 15 members. Which equation represents the relationship between the number of months the club has been opened, x, and the total fitness club membership, y?

• y=15x

• y=15x+80

• y=x+15

• y=80x+15

A rain gauge shows 3 cm of rainwater. Which of the following equations give the height, h, if it rains at a rate of 0.25 cm per hour, after t amount of hours?

• h = 0.25t + 3

• h = 3t + 0.25

• t = 0.25t - 3

• t = 3h + 0.25

A camp charges families $625 per month for one child then $225 per month for each additional child. The linear equation y = 225x + 625 represents the amount a family with x additional children would pay.  Identify the slope and y-intercept. 

• a

• b

• c

• d

The following problem has been solved, but there may be an error.  State whether the problem is correct or not.  If not, explain the error.

• This is correct.

• The student should have a y-intercept of -3, then counted down 1 and to the right 4.

• The student should a y-intercept of 3, then counted down 1 and to the right 4.

• The student should have a y-intercept of -3, then counted up 1 and to the right 4.

Write the equation in point-slope form of the line that passes through the given point and has the given slope. (3, 4); m = 6

• y - 4 = 6(x - 3)

• y - 4 = 4(x - 3)

• y- 4 = 3(x - 6)

• y - 6 = -4(x - 3)

Find the equation of the line in slope-intercept form.

• y = - 1/4x - 3

• y = 1/3x + 3

• y = - 1/4x + 2

• y = 1/3x -3