1. The document provides examples of graphing systems of inequalities on a coordinate plane. It contains 7 problems where students are asked to shade the region satisfying 3 given inequalities on a graph. 2. The problems involve skills like drawing lines representing linear equations, identifying the region between lines, and determining the intersecting area that satisfies all inequalities simultaneously. 3. Feedback is provided on the answers with notes on common mistakes like drawing lines as solid instead of dashed.

1. PPR Maths nbk
MODUL 5
SKIM TUISYEN FELDA (STF) MATEMATIK SPM “ENRICHMENT”
TOPIC : INEQUALITIES
MASA : 1 JAM
1 On the graph provided, shade the region which satisfies the three inequalities
y ≤ −3x + 12 , y > −4 and y ≤ x − 4 .
[3 marks]
Answer:
y
y = x−4
y = −3x+12
O x
2. On the graph in the answer space, shade the region which satisfies the three
inequalities 3 y ≤ x + 12, y ≥ −2 x + 4 and x < 2 .
[3 marks]
Answer :
3 y = x + 12
y
O x
y = −2 x + 4

2. PPR Maths nbk
3 On the graph, shade the region that satisfies all three inequalities :
y > x, x + y ≤ 5 and x ≥ 0. [ 3 marks ]
Answer :
y
5
4
3
2
x+y=5
1
0 1 2 3 4 5 x
4. On the graph in the answer space, draw the line x + y = 3. Hence, shade the
region which satisfies the three inequalities
x + y ≤ 3, 2y – x ≥ −6 and x> -2
X= –2 y
4
2
2y – x= –6
x
-4 -2 2 4 6
-2
-4

3. PPR Maths nbk
5. On the graph in the answer space, shade the region which satisfies the three
inequalities y ≤ 3x, 2y ≥ x and y + x ≤ 6.
y
y=3x
6
2y=x
3
x
3 6
6. Draw the line 2x + y=6. Hence, shade the region which satisfies the three
inequalities y > 3, 2x + y ≥ 6 and x + y ≤ 6.
y
6
y + x=6
3 y=3
x
3 6
7. Find the three inequalities which satisfy the shaded region in the diagram
below. y
2x+y =10
10
2x + 5y= 20
x
5 10

4. PPR Maths nbk
1 Lukis garis lurus putus-putus y = − 4 ( garis lurus dilihat ) 1
y
y = x − 4
x 2 3
y = −4
y = − 3x + 12
2 3 y = x + 12
y
y = −2 x + 4
R
x
x=2
Straight line x = 2 drawn correctly.
Region shaded correctly.
Notes: 1
1. Region satisfies two inequalities give P1.
2. Deduct one mark from K1P2 if x = 2 is a solid line. 2 3

5. PPR Maths nbk
3
y
5
4
3 y=x
2
1 x+y=5
0 1 2 3 4 5 x
Garis y = x dilukis dengan betul
Rantau dilorek dengan betul
1
(Tolak 1 markah daripada K1P2 jika y = x garis penuh
2
3