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Grade 9

6.12 Regions defined by inequalities

Worksheet
Linear inequalities
1

State whether the following inequalities are represented using a solid line or a dashed line on a graph:

a

y - 3 x > 5

b

x \geq 4

c

- 2 y + x \leq - 10

d

y + 3 x > 7

e

- y - 6 x > 0

f

y + 3 x \leq - 10

g

y \geq - 2

h

3 y + 3 x > 4

2

Write the inequality that describes the following shaded regions:

a
-5
-4
-3
-2
-1
1
2
3
4
5
x
-5
-4
-3
-2
-1
1
2
3
4
5
y
b
-4
-3
-2
-1
1
2
3
4
x
-3
-2
-1
1
2
3
4
5
6
7
y
c
-4
-3
-2
-1
1
2
3
4
x
-9
-8
-7
-6
-5
-4
-3
-2
-1
1
2
3
y
d
-4
-3
-2
-1
1
2
3
4
x
-3
-2
-1
1
2
3
4
5
6
7
y
e
-5
-4
-3
-2
-1
1
2
3
4
5
x
-5
-4
-3
-2
-1
1
2
3
4
5
y
f
-6
-5
-4
-3
-2
-1
1
2
3
4
5
x
-4
-3
-2
-1
1
2
3
4
5
6
7
8
9
y
3

Is \left(6, 20\right) a solution of y\geq 4 x + 5?

4

Is \left(3, 2\right) a solution of 3 x + 2 y \geq 12 ?

5

Determine which point satisfies each of the following inequalities:

a
x - y > 7
A
\left(-1, - 7 \right)
B
\left(8, - 5 \right)
C
\left(13, 6\right)
D
\left(0, 0\right)
b
y > 2 x
A
\left(9, 15\right)
B
\left( - 1 , - 2 \right)
C
\left(1, 4\right)
D
\left(0, 0\right)
c
y\gt - 10 x - 2
A
\left(5, - 52 \right)
B
\left( - 1 , 3\right)
C
\left( - 3 , 26\right)
D
\left(1, - 11 \right)
Graphing linear inequalities
6

Describe the three steps required to graph the inequality y + 7 x \geq 5.

7

Consider the inequality y \lt- 3 x - 6.

a

Solve for the x and y-intercepts of the line y = - 3 x - 6.

b

Determine which of the following points satisfy the inequality y \lt- 3 x - 6:

A
\left( - 7 , 2\right)
B
\left( - 6 , 3\right)
C
\left(3, - 2 \right)
D
\left( - 6 , - 3 \right)
c

Hence sketch the graph of y \lt - 3 x - 6.

d

Do the points on the line satisfy the inequality?

8

Consider the inequality y \leq - 2 x + 2.

a

Solve for the x and y intercepts of the line y = - 2 x + 2.

b

Determine which of the following points satisfies the inequality y \leq - 2 x + 2:

A
\left(2, 3\right)
B
\left(3, - 6 \right)
C
\left(4, - 2 \right)
D
\left(1, 2\right)
c

Hence sketch the graph of y \leq - 2 x + 2.

d

Do the points on the line satisfy the inequality?

9

The solutions to the equation y = x - 2 are plotted on the following graph:

a

Graph the solutions to y \gt x - 2.

b

Graph the solutions to y \leq x - 2.

-4
-3
-2
-1
1
2
3
4
x
-4
-3
-2
-1
1
2
3
4
y
10

Sketch the graphs of the following inequalities:

a
x \geq -1
b
y \lt 4
c
y \gt 0
d
x \gt 1
e
x +y \lt 3
f
x -y \geq 2
g
2x -4y \leq 8
h
x +4y \leq 6
i
y \leq x - 2
j
5 x + 2 y \geq 20
k
4 x + 3 y \gt 12
l
6 x + 3 y \gt 12
m

y \gt 2x - 4

n

y \leq 3 x - 4

o

y \lt 3x - 9

p

y \geq - 2x + 4

q
2 x + 3 y \lt 12
r

y \gt 2x - 4

s

y \leq x + 5

11

State the linear inequality that satisfies the following:

a

A linear inequality has solutions of \left(0, - 5 \right) and \left( - 1 , - 9 \right) on its boundary line and is not satisifed by \left(1, 3\right).

b

A linear inequality has solutions of \left(0, - 6 \right) and \left( - 6 , - 24 \right) on its boundary line and is satisifed by \left( - 3 , - 10 \right).

Regions defined by reciprocal functions
12

Consider the function xy=4.

a

Sketch the graph of xy=4.

b

Shade the region where xy \geq 4 for x \geq 0.

13

Graph the following regions for x\geq 0:

a
xy \gt 1
b
xy \gt 3
c
xy \leq -5
d
xy \geq 4
e
xy \gt 2
f
xy \lt -6
g
xy \geq 8
h
xy \geq 9
14

Graph the following regions for x\leq 0:

a
xy \lt 2
b
xy \lt 1
c
xy \leq 3
d
xy \leq 4
e
xy \gt -6
f
xy \geq -1
g
xy \geq -3
h
xy \geq -9
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Outcomes

9.C4.2

Graph relations represented as algebraic equations of the forms x = k, y = k, x + y = k, x – y = k, ax + by = k, and xy = k, and their associated inequalities, where a, b, and k are constants, to identify various characteristics and the points and/or regions defined by these equations and inequalities.

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