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The problems you missed are listed below with answers and explanations.  Look over the explanation for each problem so you can understand why you missed it!

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'); resetdisplay(); for(var i = 0; i <5; i++) { ganswer[i] = prompt(question[i],""); if (ganswer[i] == "quit" || ganswer[i] == "QUIT" || ganswer[i] == "Quit") { break; } q++; if (ganswer[i] == answer[i]) { c++; } else { rightans[i] = 0; w++; } resetdisplay(); } for(var i = 0; i < 10; i++) { if (rightans[i] == 0) { expl = expl + explain[i]; } } parent.frames[0].document.write(expl); parent.frames[0].document.write("
"); } question[0] = "When finding slope you use the difference of y's and the difference of x's. Which is on top, x or y?"; question[1] = 'You can test to see whether or not an equation is a function using a vertical what?'; question[2] = 'To be parallel lines must have the same what?'; question[3] = 'Do perpendicular lines have the same slope?'; question[4] = 'What variable is often used to represent slope?'; answer[0] = 'y'; answer[1] = 'line'; answer[2] = 'slope'; answer[3] = 'no'; answer[4] = 'm'; explain[0] = '#1

Slope is defined as being the "rise over run", or in other words, the slope is how far the line travels up divided by how far it travels across. y represents rise, and x represents run. Therefore y must be on top. (m = (y1 - y2)/(x1 - x2)

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Functions can only have one y value for every x value, (they are allow more than one x value for a given y value though) so if you run a vertical line (vertical means up and down) through the entire graph, you should never touch more than one point at a time.

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If 2 lines have the same slope they are changing their position at the same rate. By doing this, they can never intersect, since they are in the same plane we can conclude that this would make them parallel.

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Parallel lines have the same slope, perpendicular lines have slopes that are opposite reciprocals. (i.e. 4 and -1/4)

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Most equations represent slope as the variable m. You should be familiar with this representation, for it is used often.

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