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Aliun [14]
2 years ago
8

In the equality 5/? = ?/20, if each ? Represents the same number, then ? Must equal :

Mathematics
1 answer:
tatiyna2 years ago
3 0

Answer:

? = 10

Step-by-step explanation:

Let " ? " be x.

5 / x = x / 20

x * x = 5 * 20

x² = 100

[ 100 = 10 x 10 = 10² ]

x² = 10²

x = 10

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Let f(x) = ax+b be the line that passes through both points.

We know that f(5) = 1 and f(8) = -2. So:

\begin{cases}5a+b = 1 \\ 8a+b = -2\end{cases}

Solving the system, we get that a= -1 and b = 6.

So the line is equal to f(x) = 6-x.

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Please help me with this I don't understand it.
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2 years ago
Write an equation for the line perpendicular to the line y= -2/3+7 which passes through the point (-5,6)
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Y = -2/3x + 7.....the slope here is -2/3. A perpendicular line will have a negative reciprocal slope. All tht means is take the original slope, flip it, and change the sign. So we take -2/3....flip it making it -3/2.....change the sign making it 3/2. So ur perpendicular line will have a slope of 3/2.

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8 0
3 years ago
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juin [17]

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3 years ago
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LenaWriter [7]

Answer:

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hope i helped !!

3 0
3 years ago
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