Direct relationships are used to represent linear functions that pass through the origin.
- The direct proportional relationship of the tables are: [tex]y = 15x[/tex], [tex]y = 4x[/tex] and[tex]y = 23x[/tex].
- The unit rates are 15 pieces in 1 candy box, 4 lemons in 1 glass and 23 gallons in 1 minute
Part (a) The equation that represents the direct proportional relationship
A proportional relationship is represented as:
[tex]y = kx[/tex]
Where the proportionality constant (k) is calculated using:
[tex]k = \frac yx[/tex]
From the tables, we have the following points:
- Table 1: [tex](x,y) = (10,150)[/tex].
- Table 2: [tex](x,y) = (6,24)[/tex].
- Table 3: [tex](x,y) = (6,138)[/tex].
So, the proportionality constants for the tables are:
- Table 1: [tex]k =\frac{150}{10}=15[/tex]
- Table 2: [tex]k =\frac{24}{6}=4[/tex].
- Table 3: [tex]k =\frac{138}{6}=23[/tex].
Substitute values for k in [tex]y = kx[/tex].
So, the direct proportional relationship of the tables are:
- Table 1: [tex]y = 15x[/tex]
- Table 2: [tex]y = 4x[/tex]
- Table 3: [tex]y = 23x[/tex].
Part (b) Describe the unit rates
Table (1) represents the pieces of candy in the box of candies.
So, the unit rate is 15 pieces in 1 candy box
Table (2) represents the lemons used for glasses of lemonade
So, the unit rate is 4 lemons in 1 glass
Table (3) represents the gallons of water used in minutes
So, the unit rate is 23 gallons in 1 minute
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