Posted: 3/25/2012 5:56:08 AM EDT
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I used to be good in and liked math, Now I feel old with this SH*T. I do not care what the answer is I just need help to figure it out.. 2 + x is great then or equal to 4 I would subtract 2 from both sides to get x greater then or equal to 2 right? Edit, got it 1x2x3x4x5. Lame 5: What’s the equation of a line that passes through points (0, -1) and (2, 3)? y= 2x - 1 y= 2x + 1 x= 2y - 1 x= 2y+1 |
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As burnsy said in your other thread, and per wolframalpha. http://www.wolframalpha.com/input/?i=What%E2%80%99s+the+equation+of+a+line+that+passes+through+points+%280%2C+-1%29+and+%282%2C+3%29 |
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Quoted: As burnsy said in your other thread, and per wolframalpha. http://www.wolframalpha.com/input/?i=What%E2%80%99s+the+equation+of+a+line+that+passes+through+points+%280%2C+-1%29+and+%282%2C+3%29 ok so I make a right angle, and count the spaces from the 0x 0y?, I just do not understand the process. |
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Quoted: As burnsy said in your other thread, and per wolframalpha. http://www.wolframalpha.com/input/?i=What%E2%80%99s+the+equation+of+a+line+that+passes+through+points+%280%2C+-1%29+and+%282%2C+3%29 The easy way  |
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Quoted: Quoted: As burnsy said in your other thread, and per wolframalpha. http://www.wolframalpha.com/input/?i=What%E2%80%99s+the+equation+of+a+line+that+passes+through+points+%280%2C+-1%29+and+%282%2C+3%29 ok so I make a right angle, and count the spaces from the 0x 0y?, I just do not understand the process. y is 2x centered at 0 -> y = 2x. For every x there are 2 y. Add up the number of x and y centered at 0 Offset by -1 -> y = 2x - 1 |
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The answer is the first equation: y=2x-1 because both of those coordinate points satisfy it.
So you've got (0,-1) and (2,3). They are formatted in such a way that the first character is your 'x', and the second your 'y'. (x,y) For (0,-1) we substitute in: -1 = 2(0) -1 ––> Simplify that and you've got -1 on the left side, and -1 on the right side. Which is true. -1 does equal -1. Now for (2,3) we substitute in" 3 = 2(2) -1 ––> So on the left side of the equals sign you've got 3, and on the right side you've also got 3. Hopefully I made it simple to understand :p That's probably how they teach them in school, at least :/ Also, the 2x part is the slope of your line, or your 'm' value. So for every 1 unit of horizontal movement in the positive direction, you've got 2 units of vertical movement in the positive direction. Inversely, for every one unit move toward the negative horizontal axis, you'll have twice as much going negative in the vertical axis. So larger positive numbers in front of that 'x' give you a steep slope... e.g., a slope of 40 is much steeper than a slope of 2. A slope of '0' give you a horizontal line, and the 'b' value is simple where it passes through the vertical axis. If your 'y' is zero, then you've got a vertical line crossing the horizontal axis as whatever your 'x' value is. The -1 is the 'b' part of the slope intercept formula y=mx + b. That's the point at which your line crosses (or intercepts) the vertical axis. Shit, HS was 9 years ago and I'm nursing a hangover, so I might be a bit 'off' :p |
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Quoted:
I do not care what the answer is I just need help to figure it out..
5: What’s the equation of a line that passes through points (0, -1) and (2, 3)?
y= 2x - 1 y= 2x + 1 x= 2y - 1 x= 2y+1
Let y = Ax + B then for the first pair of coordinates, -1 = A(0) + B for the second pair, 3 = A(2) + B Now solve for A and B, and substitute into y = Ax + B. We have two equations in two unknown variables, so a solution is good to go. The first relation I wrote also supplies a shortcut; B = -1, so now we can really roll - 3 = A(2) +(-1) |
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Quoted: Quoted: Factorial means 5x4x3x2x1 I'm pretty sure. It's statistics. That part that was fucking me was 5(5i), so I 5(1x2x3x4x5) = 5(125) = 600. I was solving for 5 so 125. Check your math, pretty sure 5! Is only 120. 5(5!) is still 600 but, your gonna lose points if you have to show work and put 125. |