This is so confunsing, can someone please help? A line passes through A(3,7) and B(-4,9). Find the value of a if C(a,1) is on the line. I thought it had something to do with finding the slope . . .
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Originally Posted by wpcp15 This is so confunsing, can someone please help? A line passes through A(3,7) and B(-4,9). Find the value of a if C(a,1) is on the line. I thought it had something to do with finding the slope . . . 1)Find the equation of the line y=mx+b Now substitute x=a and y=1. You have an equation for "a" solve for it.
So m=-2/7 and y-int=-8 1=-2/7a+8 a=24.5 Is this right?
Originally Posted by wpcp15 This is so confunsing, can someone please help? A line passes through A(3,7) and B(-4,9). Find the value of a if C(a,1) is on the line. I thought it had something to do with finding the slope . . . Hello, if you have 2 separate points which lay on a line then the equation of the line is: . this formula is called two-points-formula of a straight line. Plug in the coordinates of the points. Don't forget with your problem x = a and y = 1. You'll get: . Solve for a:
Refreshing approach earboth, I usually go through the process of finding the full equation first.
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