Which of the following pairs of lines are perpendicular? y=1/2and y=2x-1 y=3x-4 and y=-1/2x-5 y=x and y=-x

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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

the second option

step-by-step explanation:

y-y1=m(x-x1)

y-1=1(x-8)