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lisabon 2012 [21]
3 years ago
12

What is the x intercept that is perpendicular to y=4/3x+1 and passes through (-4,9)

Mathematics
1 answer:
kolezko [41]3 years ago
5 0
Well, we know the line is perpendicular to that one above.... what is the slope of that one anyway?  well, notice, the equation is already in slope-intercept form   \bf y=\stackrel{slope}{\cfrac{4}{3}}x+1.

so, we're looking for the equation of a line perpendicular to that one, now, since that one has a slope of 4/3, a perpendicular line will have a negative reciprocal slope to that one, 

\bf \textit{perpendicular, negative-reciprocal slope for}\quad \cfrac{4}{3}\\\\
negative\implies  -\cfrac{4}{ 3}\qquad reciprocal\implies - \cfrac{ 3}{4}

so, what is the equation of a line whose slope is -3/4 and runs through -4,9?

\bf \begin{array}{ccccccccc}
&&x_1&&y_1\\
&&(~ -4 &,& 9~)
\end{array}
\\\\\\
% slope  = m
slope =  m\implies -\cfrac{3}{4}
\\\\\\
% point-slope intercept
\stackrel{\textit{point-slope form}}{y- y_1= m(x- x_1)}\implies y-9=-\cfrac{3}{4}[x-(-4)]
\\\\\\
y-9=-\cfrac{3}{4}(x+4)

now, the x-intercept for any function is found by zeroing out the "y" and solving for "x", thus

\bf y-9=-\cfrac{3}{4}(x+4)\implies 0-9=-\cfrac{3}{4}(x+4)\implies -9=-\cfrac{3x}{4}-3
\\\\\\
-6=-\cfrac{3x}{4}\implies -24=-3x\implies \cfrac{-24}{-3}=x\implies 8=x

x = 8, y = 0           ( 8 , 0 )
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Correct question is;

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No, the lengths would not be the same. This is due to the fact the the paper clips could be in different sizes.

Step-by-step explanation:

We are told that he wants to make four necklaces that are the same way and that he told his friends to cut the string for the necklace 15 paper clips long.

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