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Zina [86]
3 years ago
8

Write the equation for the line parallel to the given line 4x-3y=9 and through the point (3, -1). Then Write the answers in slop

e intercept and standard form
Mathematics
1 answer:
Katyanochek1 [597]3 years ago
7 0

k:y=m_1x+b_1;\ l:y=m_2x+b_2\\\\k\ \perp\ l\iff m_1\cdot m_2=-1\\\\k\ ||\ l\iff m_1=m_2

We have:

4x-3y=9\ \ \ \ |-4x\\\\-3y=-4x+9\ \ \ \ |:(-3)\\\\y=\dfrac{4}{3}x-3\to m_1=\dfrac{4}{3}

y=m_2x+b\\\\m_2=m_1\to m_2=\dfrac{4}{3}

y=\dfrac{4}{3}x+b

The line passest through the point (3, -1). Substitute the coordinates of the point to the equation of a line:

-1=\dfrac{4}{3}\cdot3+b\\\\-1=4+b\ \ \ \ |-4\\\\b=-5

y=\dfrac{4}{3}x-5\ \ \ \ |\cdot3\\\\3y=4x-15\ \ \ \ |-4x\\\\-4x+3y=-15\ \ \ \ |\cdot(-1)\\\\4x-3y=15

Answer: \boxed{y=\dfrac{4}{3}x-5;\ 4x-3y=15}

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