Easy. If you have a line graph and you, say, are doing a graph on how many fruits are eaten in a month. Then lemons could be low while melons are high, then they slowly change round, so melons are low and lemons are high.
Hope this helped.
Improved Answer:-
If they are simultaneous equations then the lines will intercept af a point on the graph
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The graph must have at least one intercept.
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1) You write the equation in slope-intercept form, if it isn't in that form already. 2) An easy way to graph it is to start with the y-intercept. For example, if the intercept is +5, you graph the point (0, 5). Then you add an additional point, according to the slope. For example, if the slope is 1/2, you go 2 units to the right, and one up, and graph a point there.
If that should be y = 2 the slope is 0 and the y intercept is 2.
this is not a valid equation. I assume you mean: 2X+8Y=36 in which case the graph is a line with a slope of 1/4 and a y-intercept at 9/2 or 2X+4Y+2=36 in which case the graph is still a line with a slope of 1/2 and a y-intercept at 17/2