Slopes & etc.: intercepts, graphing, Vertical Line Test,

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lisaz0224

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Oct 5, 2008
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I'm really happy because my teacher told me I could take the Regents Exam this year!! Yet, I still need to know a lot of things....

Like, for example, I know that if y=3x+2, then 2 would be the y intercept and 3x would be the amount of paces you move on the x axis, right? So, basically, if I were given the equation y=3x+2, in order to graph the slope, I would have to move three to the right and two up and keep doing that? My teacher tried to explain it to me, but we only had half an hour and she didn't finish.

Another thing is something like, "the vertical line test." I really don't remember what that is, I think it's like something you use to see if your line is linear or not.... I'm probably wrong. Can someone tell me??

Thanks!!

By the way, don't be surprised if I keep asking about this stuff; it's kind of hard to keep up.
 
"Like, for example, I know that if y=3x+2, then 2 would be the y intercept and 3x would be the amount of paces you move on the x axis, right? So, basically, if I were given the equation y=3x+2, in order to graph the slope, I would have to move three to the right and two up and keep doing that? My teacher tried to explain it to me, but we only had half an hour and she didn't finish."

Actually the slope is 3, so that means from 2 on the y-axis (the y-intercept, you go up 3 and to the right 1.
 
"Another thing is something like, "the vertical line test." I really don't remember what that is, I think it's like something you use to see if your line is linear or not.... I'm probably wrong. Can someone tell me??"

The Vertical Line Test is used to determine is a graph is a function. If a vertical line intersects the graph at more than one point ANYWHERE, it is not a function.

Any linear function can be put into the form y = mx + b.
 
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