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Linear means a straight line.
-3x+9y=18; find the x and y intercept of the line
Slope intercept form. It's not just college algebra, it's algebra. It defines the slope of well... a slope. Y=mx+b. M in the equation is the slope and b is always the y-intercept. So if you want to find the slope of a line on a graph, this would most likely be the most common equation in algebra to find it.
You don't need advanced algebra to prove that it is impossible to trisect a line segment using only a straight edge and a compass: anyone knows that you will also need a pencil! And one you have that then there are plenty of easy ways to do it.
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