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F7 Functions Review 4
供稿人: Cason
zero
positive
Slope
negative
undefined
Substitue the ordered pairs for x and y and then check
to see if the equation is balanced.

y = x + 4 for (5, 2) would be 2 = 5 + 4;  2 ≠ 9.  It does not work.

  (3, 7)

The point represented by which ordered pair is NOT

 on the graph of y = x + 4?

  (2, 6)

(0, 4)

(2, 2)

  -2

What is the output value of y for y = 3x + 4 if the input

value x is -2?

  10

   1

  7

y = mx + b
slope
y intercept

y = 4x

Which function describes the sequence 4, 6, 8, 10,

12...?

y = x + 2

y                   4        6       8      10      12      14 
x        0        1        2        3       4        5        6    
y intercept

y = 3x + 1

y = 2x + 2

Find the y intercept and the slope.

Which function describes the sequence 4, 8, 12, 16...?

y = x + 2

y = 4x

y = 3x + 1

y = 2x + 2

y = 4x

Which function describes the sequence 3, 4, 5, 6...?

y = x + 2

y = 3x + 1

y = 2x + 2

Which function describes the sequence 4, 7, 10, 13...?

y = 4x

y = x + 2

y = 2x + 2

y = 3x + 1

14

What is the next term in the sequence 21, 20, 18, 15...?

11

12

13

y = 3x - 1

Which linear function matches these ordered pairs?

(-1, -8)

( 0,  -3)

( 1,    2)

 

y = x - 3

Substitute the ordered pairs back in to see which equation
will work for all three.

y = 5x -3

y = 2x + 3

y = 4x + 3

5x = y

A direct variation is y = kx.  Which of the following is

  a direct variation?

y = x + 5

xy = 8

True

A direction varation always goes through (0, 0).

False

True

Linear function make a line.

False

x

4

y

In the equation y = 4x the constant of variation (slope)

 is...

12

1

In the equation y = 4x when x = -3, y = ?

Remember it is a proportion.
Substitute -3 in for x and solve.

-12

4/3
Parallel lines have thesame slope.
y =    x + 6
y =    x - 7
3
3
Perpendicular lines haveopposite sign,reciprocal slopes.
y =    x + 6y =    x + 5
-⅓
3
Drag and drop your answers.
What is the slope of all lines parallel to the above?

What is the slope of all lines perpendicular to the above?
y = ¾x + 5
-4/3
?
¾
?
What is the slope of alllines parallel to it?
What is the slope of all lines perpendicular to it?
Put any needed negative signs with the top number.
y = 4x + 7
What is the slope of alllines parallel to it?
What is the slope of all lines perpendicular to it?
Put any needed negative signs with the top number.
y = ⅜x + 7
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