Question

Which lines are perpendicular to 5x + 4y = 8?

Choose all answers that are correct.

A. –5x + 4y = –5

B.5y = –4x – 15

C.5y = 4x + 5

D.–4x + 5y = 10

Answer 1

our first step is to convert each equation into y = mx + b form, do you know how to do that?

Answer 2

YES, is one of the answers A?

Answer 3

hm, I don't think A is one of the answers, let's walk it through step by step

let's start with the original equation

5x + 4y = 8

we can re-arrange this to get

4y = -5x + 8
y = (-5/4)x + 2

the slope of the original equation is (-5/4), so any line that is perpendicular will have a slope of (4/5)

check each of the four answer choices to see which one(s) have a slope of 4/5

Answer 4

D

Answer 5

D is one of the answers, yes. there's also one more, can you find it? :)

Answer 6

I think so, just a sec

Answer 7

@Vocaloid great job

Answer 8

thank you ^_^

Answer 9

its D the answer and i sure about it

Answer 10

yup, C and D are both answers

Answer 11

Thanks so much!!!!

Answer 12

@Vocaloid @Vocaloid , @freemap