1. Which relation is a function?

{(1, 2); (2, 3); (3, 4); (1, 5)}

{(1, 2); (1, 3); (1, 4); (1, 5)}

{(1, 2); (2, 3); (3, 4); (2, 5)}

{(1, 2); (2, 2); (3, 2); (4, 2)}

.2. What is the range of the relation? {(1, 2), (2, 4), (3, 2), (4, 6)}

{1, 2, 3, 4}

{1, 2, 3, 4, 6}

{2, 4, 6}

{2, 4}

3. For the function f(x) = 2 – 3x, find f(0).

–3

–1

2

5

4. What is the turning point of the graph of f(x) = |x| + 4

(0, 4)

(0, –4)

(4, 0)

(–4, 0)

1. {(1, 2); (2, 2); (3, 2); (4, 2)}

2. {2, 4, 6}

3. 2

4. (–4, 0)

6. Which equation represents a direct linear variation?

y = x2

y=2/5x

y=1/x

y = x + 3

7. Which is the direct linear variation equation for the relationship?

y varies directly with x and y = 12 when x = 4.

y = 2x + 4

y = 3x

y = x + 8

y = x – 8

9. Which is the quadratic variation equation for the relationship?

y varies directly with x2 and y = 48 when x = 2.

y =1/12 x2

y = 12x2

y = 1/24 x2

y = 24x211. y varies inversely with x and y = 8 when x = 2.

Which is the inverse variation equation for the relationship?

y = 16x

y=16/x

y = 2x

y = x + 2

.12. If f(x) varies directly with x and f(x) = 24 when x = –4, then what is f(x) when x = 12?

–2

–6

–48

–72

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