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

choose all answers that are correct.

_5x + 4y = _5
5y = _4x _ 15
5y = 4x + 5
_4x + 5y = 10

If two lines are penpendicular their slopes has to be reciprocal, satisfying the next condition:

Step-by-step explanation:

First of all we have to obtain the slope of each line, we can do this by reducing the line equation into this form:

, where m represents the slope.

246

step-by-step explanation:

hello from mrbilldoesmath!

answer:

(7 x + 6 y) (49 x^2 - 42 x y + 36 y^2)

discussion:

the trick is to recognize that 343 = 7^3 and 216 = 6^3 and, in general,

a^3 + b^3 =   (a + b) (a^2 - a b + b^2).

in our case

343x^3+216y^3   =   (7x)^3 + (6y)^3

so take a = 7x and b = 6y in the above equation to get the answer.

you,

mrb