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- anonymous

Help!! Definate Medal!!!
Which lines are perpendicular to 5x + 4y = 8?
Choose all answers that are correct.
4y=-5x+4
4y= 5x + 12
5y = 4x + 15
5y = –4x – 15
My answer is 4y=-5x+4.. what do you think

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- anonymous

- chestercat

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- MrNood

first write the equation as
y = mx +b
the value m is the slope of th eoriginal line
all perpendicular lines will have slope = -1/m

- MrNood

btw - I think your answer is incorrect...

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- anonymous

y = mx +b=4y=-5x+8

- MrNood

you need to show some work - otherwise you can just guess all 4 until I say...
what is the slope of the original line?
then - what is the slope of any perpendicular line..?

- MrNood

4y=-5x+8
so
y= ??

- anonymous

No I wasn't guessing all 4 -.-, you asked me to rewrite the equation in the formula y = mx +b so i did and i wanted you to take me from there.

- anonymous

cause im kinda confused

- anonymous

y=−5/4+2

- anonymous

Slope is −5/4

- anonymous

Y = 2 @MrNood

- anonymous

but im confused from there..:(

- anonymous

@Hero help please

- MrNood

OK so slope of original line is -5/4
and so the slope of any perpendicular line is -1/m
-1 /(-5/4) = 4/5
so which of the answer options has a slope of 4/5?
(hint - the offset value i.e. the constant number does not affect the slope or answer....)

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