Linear Graphs - Perpendicular Lines

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noodlestopshop
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#1
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"Write down the equation of the line that is perpendicular to 3x - y = 1 and passes through (0,9)"
How would I work this out?
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lordaxil
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(Original post by noodlestopshop)
"Write down the equation of the line that is perpendicular to 3x - y = 1 and passes through (0,9)"
How would I work this out?
Might be helpful to break this down into three steps:
i) what is the general equation for a line?
ii) what does it mean for a line to pass through a point?
iii) what does it mean for a line to be perpendicular to another line?

Further hints are below, if you need them

Ai) y = mx + c (m and c are constants, gradient and intercept)
Aii) solve Ai for the point given
Aiii) If two lines are perpendicular, then their gradients will multiply together to give -1
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noodlestopshop
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(Original post by lordaxil)
Might be helpful to break this down into three steps:
i) what is the general equation for a line?
ii) what does it mean for a line to pass through a point?
iii) what does it mean for a line to be perpendicular to another line?

Further hints are below, if you need them

Ai) y = mx + c (m and c are constants, gradient and intercept)
Aii) solve Ai for the point given
Aiii) If two lines are perpendicular, then their gradients will multiply together to give -1
would it be y= -1/3x+9 ?
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lordaxil
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(Original post by noodlestopshop)
would it be y= -1/3x+9 ?
correct.
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