Write the standard form of the equation of the line described.
#1) through: (-5,3), perpendicular to y=5/7x+4.

Question

anonymous · Answer

do you know what the slope of 
$$\huge y=\color{red}{\frac{5}{7}}x+4$$ is ?

anonymous · Answer

5/7

anonymous · Answer

ok good
so the perpendicular  line will have slope ?

anonymous · Answer

5/7

anonymous · Answer

no, that would be the slope of any parallel line
you are asked for a perpendicular line

anonymous · Answer

what would it be?

anonymous · Answer

in english (math english) it is the "negative reciprocal" i.e. flip it and change the sign

anonymous · Answer

-7/5

anonymous · Answer

right

anonymous · Answer

now use the point slope formula to find the equation, since you have a point and the slope

anonymous · Answer

y=-7/5x-5, is this the correct answer?

anonymous · Answer

i doubt it, since it has all those fractions

anonymous · Answer

$$y-3=-\frac{7}{5}(x+5)$$ is a start

anonymous · Answer

multiply out and get $$y-3=-\frac{7}{5}x-7$$ oh look the fractions are gone, but now you add $3$ to both sides

anonymous · Answer

y=-7/5x-4

anonymous · Answer

looks good to me

anonymous · Answer

My textbook said the answer would be 7x+5y=-20

anonymous · Answer

that is because your text had you answer in standard from rather than point slope form

triciaal · Answer

the question asked for standard form