Using Technology to Picture Change

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Component 3

Using Technology to Picture Change

3

Using Technology to

Picture Change

The intersection is the solution!

Cinderella y

1 = 50 + 5 w

Stepsister y

2 = 170 – 10 w

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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?

Check your

Work

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?

Check your

Work

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 slopeintercept form.

Check your

Work

3

Using Technology to

Picture Change y

= 5 x

+50

Spent $170 and an additional $10 a week

Write this equation in slope-intercept form.

Check your

Work

3

Using Technology to

Picture Change

Cinderella in y

1 y x

+ 50 y intercept = 170

Stepsister in y

2 y

= -10 x

Continue

3

Using Technology to

Picture Change

Press ZOOM and x learn that when y x and select option 5 y both girls will have

(amounts of money)

160

120

80

40

40 80 120 160

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