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Find the equation of the line the line is perpendicular to the graph of x - 5y=6 and contains 2,-10

User Md Zahid
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1 Answer

4 votes

Answer:

y + 10 = - 5 (x - 2) [point-slope form] OR

y = - 5 x [slope-intercept form]

Explanation:

Identify the slope of the given line

If we rewrite the equation given, we can easily identify the slope

x - 5y = 6

- 5y = - x + 6

y = ¹/₅ x - ⁶/₅

∴ the slope of x - 5y = 6 is ¹/₅

Find the slope of the perpendicular line

When two lines are perpendicular, the product of their slopes is -1. This means that the slopes are negative-reciprocals of each other.

⇒ since the slope of this line = ¹/₅

then the slope of the perpendicular line (m) = - 5

Determine the equation of perpendicular line

We can now use the point-slope form (y - y₁) = m(x - x₁)) to write the equation for this line:

⇒ y - (-10) = - 5 (x - 2)

∴ y + 10 = - 5 (x - 2)

We can also write the equation in the slope-intercept form by making y the subject of the equation and expanding the bracket to simplify:

since y + 10 = - 5 (x - 2)

y = - 5 x

∴ the slope-intercept equation of the perpendicular line is y + 10 = - 5 (x - 2) OR y = - 5 x.

To test my answer, I have included a Desmos Graph that I graphed using the information provided in the question and my answer.

Find the equation of the line the line is perpendicular to the graph of x - 5y=6 and-example-1
User Dieterg
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5.3k points