**Writing an equation in slope intercept form worksheet :**

Worksheet on writing an equation in slope intercept form is much useful to the students who would like to practice problems on modeling real-world situations as slope intercept form equation.

1. Greta makes clay mugs and bowls as gifts at the Crafty Studio. She pays a membership fee of $15 a month and an equipment fee of $3.00 an hour to use the potter’s wheel, table, and kiln. Write an equation in the form y = mx + b that Greta can use to calculate her monthly costs.

2. Ken has a weekly goal of burning 2400 calories by taking brisk walks. Ken would like to burn 300 calories per hour. Write an equation in the form y = mx + b that can use to calculate number of calories left to burn.

**Problem 1 :**

Greta makes clay mugs and bowls as gifts at the Crafty Studio. She pays a membership fee of $15 a month and an equipment fee of $3.00 an hour to use the potter’s wheel, table, and kiln. Write an equation in the form y = mx + b that Greta can use to calculate her monthly costs.

**Solution :**

**Step 1 : **

Find the independent variable x, for the given situation.

The number of hours Greta uses the studio

**Step 2 :**

Find the dependent variable y, for the given situation.

The money Greta pays the studio each month

**Step 3 :**

For example, during April, Greta does not use the equipment at all.

Find the number of hours (x) for April.

0

Find her cost (y) for April.

$15

Find the y-intercept "b" in the equation.

15

**Step 4 :**

For example, during May, Greta uses the equipment for 8 hours.

Find her cost (y) for May.

$15 + 8($3) = $39

In June, if she spends 11 hours, then her cost is $48.

From May to June, the change in x-values is +3.

From May to June, the change in y-values is +9.

Find the slope "m" in the equation y = mx + b.

m = change in y-values / change in x-values

m = 9 / 3

m = 3

**Step 5 : **

Use the values for m and b to write an equation for Greta’s costs in the form y = mx + b :

y = 3x + 15

**Problem 2 :**

Ken has a weekly goal of burning 2400 calories by taking brisk walks. Ken would like to burn 300 calories per hour. Write an equation in the form y = mx + b that can use to calculate number of calories left to burn.

**Solution :**

**Step 1 :**

Find the independent variable x, for the given situation.

Number of hours taken by Ken to take brisk walk.

**Step 2 :**

Find the dependent variable y, for the given situation.

Number of calories left to burn after "x" hours.

**Step 3 :**

For example, on the first day of the week, Ken does take brisk walk.

Since, he does not take brisk walk on the first day of the week, the value of "x" is

0

Number of calories left to burn after the first day :

2400

Find the y-intercept "b" in the equation.

2400

**Step 4 :**

For example, Ken takes brisk walks for 1 hour on the second day of the week.

Find the number of calories left to burn after the second day.

2400 - 300(1) = 2100

On the third day, if he take brisk walks for 2 hours, then the number of calories left to burn after the third day is

1500

From the first day to third day, the change in x-values is

+3.

From the first day to third day, the change in y-values is

-900.

(Since the calories burned, negative sign is taken)

Find the slope "m" in the equation y = mx + b.

m = change in y-values / change in x-values

m = -900 / 3

m = -300

**Step 5 : **

Use the values for m and b to write an equation for Greta’s costs in the form y = mx + b :

y = -300x + 2400

After having gone through the stuff given above, we hope that the students would have understood "Writing an equation in slope intercept form worksheet".

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