Component 3

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The intersection is the solution!
Cinderella y 1 = 50 + 5 w
Stepsister y 2 = 170 – 10 w

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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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Work

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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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Did you answer that y = $50 when x = 0?
If m = 5 and b = 50, write
Cinderella’s equation in slopeintercept form.
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3
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Picture Change y = 5 x +50
Write this equation in slope-intercept form.
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Cinderella in y
1 y = 5 x + 50 y intercept = 170
Stepsister in y
2 y = -10 x +170
Continue

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Press ZOOM and x learn that when value x will be 90. At and select option 5 y both girls will have values
(amounts of money)
160
120
80
40
40 80 120 160

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