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Question 302616: Here's another accuplacer practice question that I have no clue about: "write the slope intercept form of the equation (-2,0)and (7,4). The answer that lights up correct is Y=4/9x + 8/9. Can someone tell me why this is correct, and in general , how to write slope intercept forms? Thanks lots.
Answer by nerdybill(7384)   (Show Source):
You can put this solution on YOUR website! Here's another accuplacer practice question that I have no clue about: "write the slope intercept form of the equation (-2,0)and (7,4). The answer that lights up correct is Y=4/9x + 8/9. Can someone tell me why this is correct, and in general , how to write slope intercept forms? Thanks lots.
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Given:
(-2,0)and (7,4)
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First, determine the slope:
m = (y2-y1)/(x2-x1)
m = (4-0)/(7-(-2))
m = (4)/(7+2)
m = 4/9
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Now, plug the slope (4/9) and one of the two points (-2,0) into the "point-slope" form:
y - y1 = m(x - x1)
y - 0 = (4/9)(x - (-2))
y = (4/9)(x + 2)
y = (4/9)x + (4/9)2
y = (4/9)x + 8/9
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