Need Algebra help plz

Algebra
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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)

Apr 17th, 2015

1.   {(1, 2); (2, 2); (3, 2); (4, 2)}

2. {2, 4, 6}

3. 2

4.  (–4, 0)

Apr 17th, 2015

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


Apr 17th, 2015

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