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Question 435093: solve linear equation: m=5/6; (9,-7)
My problem is that I get stuck at the very last calculation of the equation. Here's waht I mean:
I understand how to substitute all the values to their appropriate variables. The nest to last step in this problem is: y+7-5/6x-15/2-7...calculating this to finalize the answer is where i get stuck. I keep getting the wrong answer.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! solve linear equation: m=5/6; (9,-7)
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There is a simpler way of doing these.
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Form: y = mx + b
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You know y = -7 when x = 9 and you know m=5/6,
so solve for "b":
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-7 = (5/6)(9)+b
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Multiply thru by 6 to get:
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-42 = 45 + 6b
6b = -87
b = -87/6
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Equation:
y = (5/6)x-(87/6)
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If you want to do use the point-slope form:
y--7 = (5/6)(x-9)
Multiply thru by 6 to get:
6y+42 = 5x-45
6y = 5x - 87
y = (5/6)x-(87/6)
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Cheers,
Stan H.
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