Component 3 Using Technology to Picture Change

Component 3Using Technology to Picture Change

3 Using Technology to Picture Change

Cinderellay1 = 50 + 5w

Stepsistery2 = 170 – 10w

The intersection is the solution!

3 Using Technology to Picture Change

Cinderella had only $50 in her savings account, and saved $5 each week.

What will be the weekly increase or rate of change in her account?

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3 Using Technology to Picture Change

The weekly change is $5 so, m =5

x = number of weeks she worked

y = the amount of money in her account

If x = 0, what is y?

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3 Using Technology to Picture Change

Did you answer that y = $50 when x = 0?

If m = 5 and b = 50, write Cinderella’s equation in slope-intercept form.

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3 Using Technology to Picture Change

y = 5x +50

Spent $170 and an additional $10 a week

Write this equation in slope-intercept form.

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3 Using Technology to Picture Change

slope = -10

y intercept = 170

y = -10x +170

Cinderella in y1y = 5x + 50

Stepsister in y2y = -10x + 170

Continue

3 Using Technology to Picture Change

Press ZOOM and Select 0.

x value (number of weeks)

y values (amounts of money)

160

120

80

40

40 80 120 160

Press enter to learn that when x is 8, y will be 90. At the end of week 8, both girls will have $90.

Press 2nd trace and select option 5

Component 3 Quiz

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