ALGEBRA I /// Relations and Functions help!!! pls

Mathematics

1 answer:

Volgvan3 years ago

5 0

Place the x values (if there are two of the same x value you only include it once) in the first box vertically like:
5
-3
6
2
Place the y values (if there are two of the same y values only include it once) in the 2nd box vertically like:
1.2
7
-3
Now draw lines from your x values to their corresponding y values.
A function may NOT have two y-values assigned to the same x-value, but it may have two x-values assigned to the same y-value.
So this is a function!

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Number of weekend minutes used: x
Number of weekday minutes used: y

This month Nick was billed for 643 minutes:
(1) x+y=643

The charge for these minutes was $35.44
Telephone company charges $0.04 per minute for weekend calls (x)
and $0.08 per minute for calls made on weekdays (y)
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(2) 0.04x+0.08y=35.44

Using the method of substitution
Isolating x from the first equation:
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(3) x=643-y

Replacing x by 643-y in the second equation
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Answers:
The number of weekends minutes used was 400
The number of weekdays minutes used was 243

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