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October 22, 2014

October 22, 2014

Posted by **maryk** on Sunday, September 13, 2009 at 8:28am.

5x+y=30

-5x =30-5x

y= 25x

so the points to plot would be -5,25 ? I do not think is correct - please help

- algebra -
**Sharon**, Sunday, September 13, 2009 at 8:34amStart with an x column and next to it have a y column so for every x answer you have there will be a corresponding y answer. For example start with assigning x=1, plug it in the equation and find out what y equals. Then assign x=2 then plug it in and find out what y is, and so on and so on until you have a good graph representation of what the answer looks like. So, you will have a multitude of x and y answers. Hope this helps

- algebra -
**MathMate**, Sunday, September 13, 2009 at 8:52am5x+y=30 is a single equation with two variables, which means that it gives a relationship between the variables.

In this case, the points that satisfy the relationship form a line.

You can reorganize the equation to read:

5x+y=30

y=30-5x

As sharon suggested, make a table of values of x and y. Designate values of x (say from -5 to +5) and calculate the corresponding values of y. Plot these pairs of values, or points, on the graph and you should obtain a straight line if there are no errors. For example:

x y

-5 55

-4 50

-3 45

...

5 5

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