K w.

asked • 08/07/17

Equation for line L

Write an equation for line L in point-slope form and slope-intercept form. L is perpendicular to y=5x.
Lines intersect at (-1,-5).

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Mark M. answered • 08/07/17

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point-slope form
slope is negative inverse of 5.
-1/5 = (y + 5) / (x + 1)
 
Can you convert to slope-intercept?
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K w.

No sir I don't know how
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08/07/17

Mark M.

-1/5 = (y + 5) / (x + 1)
-1 = 5(y + 5) / (x + 1)    multiply both sides by 5
-1(x + 1) = 5(y + 5)       multiply both sides by x + 1
-x - 1 = 5y +25              distribute
-x - 26 = 5y                   subtract 25 from both sides
-x/5 - 26/5 =y               divide both sides by 5
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08/07/17

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