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2 years ago

8

In Ms. Perron’s class, 75% of the students are boys. There are 18 boys in the class. What is the total number of students in Ms.

Perron’s class?

1 answer:

g100num [7]2 years ago

3 0

Answer:

The total number of students is 24

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kotykmax [81]

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

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$4x-5y=2\ \ \ \ |-4x\\\\-5y=-4x+2\ \ \ \ |:(-5)\\\\y=\dfrac{4}{5}x-\dfrac{2}{5}\to m_1=\dfrac{4}{5}\\\\l:y=m_2x+b\\\\k\ \prep\ l\Rightarrow\dfrac{4}{5}m_2=-1\ \ \ \ |\cdot\dfrac{5}{4}\\\\m_2=-\dfrac{5}{4}$

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The line l is passing through point (0, 0). Substitute the coordinates of the point to the equation of a line l:

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<h2>Answer: 5x + 4y = 0</h2>

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