posted by maryk .
I am trying to solve 5x+y=30 - this is what I have completed so far.
so the points to plot would be -5,25 ? I do not think is correct - please help
Start 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
5x+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:
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: