# How do I draw this graph?

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NateRiver
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16 Jan 2013, 12:24 pm

y=3x
y= x+2
y=2x+3
y=3x+2

I have no idea, so some basic principles may need to be included.

ruveyn
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16 Jan 2013, 12:32 pm

y = 3x. A line of slope 3 through the origin

y = 3x + 2 a line of slope 3 through the point (0,2)

y = 2x + 3 a line of slope 2 through the point (0,3)

y = x + 2 a line of slope 1 through the point (0,2)

ruveyn

kra17
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16 Jan 2013, 12:45 pm

You could google those and it will draw it for you

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Comp_Geek_573
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16 Jan 2013, 11:24 pm

Here's a way to do it without a calculator or Google:

Take a number of different x-values and evaluate y with them. Plot those points on the graph.

For instance, with y = x + 2:
x = 0, y = 2 - plot (0, 2) on the graph
x = 1, y = 3 - plot (1, 3)
x = 2, y = 4 - plot (2, 4)
x = 3, y = 5 - plot (3, 5)

Draw a line that goes through all these points.

All the examples given are linear equations - so all you really need is two points and then just use a ruler to draw a line going through both of them. With quadratic equations and other functions that curve, you'll need more points than that and to draw the best curve you can through them all.

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naturalplastic
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18 Jan 2013, 11:27 am

kra17 wrote:
You could google those and it will draw it for you

You could figure it out for yourself on a piece of paper faster than you can Google it probably!