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Byju's Answer
Standard VIII
Mathematics
Representation of Point on the Plane
Draw the grap...
Question
Draw the graph of equation 2x - y + 1 = 0, using the graph. Find the value of y, when x = -2. [4 MARKS]
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Solution
Concept: 1 Mark
Graphs: 3 Marks
2x - y + 1 = 0
y = 2x + 1
x
0
1
2
y
1
3
5
(
x
,
y
)
(
0
,
1
)
(
1
,
3
)
(
2
,
5
)
When x = 0, then
y
=
2
×
0
+
1
=
1
When x = 1, then
y
=
2
×
1
+
1
=
3
When x = 2, then
y
=
2
×
2
+
1
=
5
Now, plot the points A(0, 1), B(1, 3) and C(2, 5) on a graph paper. Draw a line passing through points A, B and C.
Then, the line AB is the required graph of 2x - y + 1 = 0.
When x = -2, y = -3.
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