How do you solve simultaneous equations graphically? I do not know how to plot t

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secondary 2 | Maths
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secondary 2 Maths Singapore

How do you solve simultaneous equations graphically? I do not know how to plot the points. Any help would be greatly appreciated.

Date Posted: 3 years ago

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To plot the graphs of linear equations, you can simply sub in certain values of x and then find out the value of y when x is that value

For example, for the linear equation 5x - 2y = 4, we can try subing in the value of x = 0 and x = 2.

For x = 0,
5(0) - 2y = 4
-2y = 4
y = 4/(-2)
y = -2
Therefore, when x = 0, y = -2

For x = 2,
5(2) - 2y = 4
10 - 2y = 4
-2y = 4 - 10 = -6
y = (-6)/(-2)
y = 3
Therefore, when x = 2, y =3

From these, you can plot the points of (0,-2) and (2,3), and then draw a line that intersects these two points for the graph of 5x - 2y =4

You can then repeat this process for the other equation as well

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