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In the xy-plane

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bhumika.k.shah
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Topic: In the xy-plane
PostThu Jan 07, 2010 10:45 pm
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In the xy-plane, what is the slope of the line with equation 3x + 7y = 9?
A. - 7/3
B. - 3/7
C. 3/7
D. 3
E. 7

Ans : B

is it true? if so , why so ??
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2009wish
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PostThu Jan 07, 2010 10:59 pm
Equation for the slope of a line is .... y=mx +c

when the equaiton is rewritten .....y=-3/7x+9/7
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bhumika.k.shah
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PostThu Jan 07, 2010 11:10 pm
2009wish wrote:
Equation for the slope of a line is .... y=mx +c

when the equaiton is rewritten .....y=-3/7x+9/7
Why the - sign ? why -3/7 ? and why not - 9/7 then ?
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PostThu Jan 07, 2010 11:23 pm
Let's re-phrase the eqn 3x + 7y = 9 to the form
y= mx + c

7y = -3x + 9
y = (-3/7)x + 9/7

m is the slope of line. So, Slope is -3/7.
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