How do I draw this graph?  Page 1 of 1 [ 5 posts ]

NateRiver
Sea Gull  Joined: 8 Feb 2012
Gender: Female
Posts: 245

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
Veteran  Joined: 21 Sep 2008
Age: 83
Gender: Male
Posts: 31,726
Location: New Jersey

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
Veteran  Joined: 14 Feb 2010
Age: 26
Gender: Male
Posts: 594
Location: Sweden

You could google those and it will draw it for you

_________________  Comp_Geek_573
Veteran  Joined: 27 Sep 2011
Age: 35
Gender: Male
Posts: 723

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
Veteran  Joined: 26 Aug 2010
Age: 64
Gender: Male
Posts: 21,421
Location: temperate zone

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!