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Question 701924: please help!
3x-4y=8 is this a function?? how do you get domain and range?
Answer by lwsshak3(11628)   (Show Source):
You can put this solution on YOUR website! 3x-4y=8 is this a function?? how do you get domain and range?
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Rewrite equation to express y in terms of x.
3x-4y=8
4y=3x-8
y=3x/4-2
You can see that for each x there is one y-value; therefore, this is a function by definition.
You can also see that there is no restriction on what the x values can be, so the domain is (-∞,∞) or all real numbers.
To determine range interchange x and y and solve for y. This is equivalent to expressing x in terms of y.
3x-4y=8
3y-4x=8
3y=4x+8
y=4x/3+8/3
You can also see that there is no restriction on what the x values can be, so the range is (-∞,∞) or all real numbers.
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