NOTES:
Domain is: all the x-values
Range is: all the y-values
Function is: no duplicate x-values
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10)
D: {11, 12, 13, 15, 16}
R: {7, 8, 10, 10.5, 11}
This is NOT a function because there are 2 different y-values when x = 15.
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11) y = 50x + 75
f(1) = 50(1) + 75 = 125
f(2) = 50(2) + 75 = 175
f(3) = 50(3) + 75 = 225
f(4) = 50(4) + 75 = 275
x | y
1 | 125
2 | 175
3 | 225
4 | 275
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12) {(4, 1), (8, 1), (8, 2), (12, 2), (12, 3), (16, 4), (20, 3)}
D: {4, 8, 12, 16, 20}
R: {1, 2, 3, 4}
This is NOT a function because there are 2 different y-values when x = 8. It also fails when x = 12