Question

through (2,-5) ; perpendicular to 3y=x-6
I got y=3x-11 the answer is y=-3x-1. what did i do wrong

Answer 1

okay, so perpendicular to 3y = x- 6 means that the slope of the desired equation is the negative reciprocal of 3y = x-6. However this equation is not yet in proper form. To get it in the form y = mx + b, we divide the equation by 3 on both sides, to get y = (x/3) - 2. From this we get that the slope is 1/3. So the slope of the equation you are deriving is -3, because -3 * 1/3 = -1. So, y = -3x + b. To find b, the y intercept, plug in the (x, y) pair (2, -5) you were told the equation goes through. -5 = -3*2 + b; b = -5 + 6 = 1; so y = -3x + 1

Answer 2

you went wrong when you said the y-intercept was -1, because it is in fact 1

Answer 3

y=(1/3) x-2
perpendicular to slope
is negative reciprocal
so u did 3
where it is supposed to be -3

Answer 4

uh ok goddess explained it

Answer 5

where did -3 come from

Answer 6

From the answer you derived it seems you know the general method, you just have to be careful with the arithmatic

Answer 7

if m is slope of a line
then its peripendicular is -1/m

Answer 8

-3 is the negative reciprocal of 1/3. The slope of an equation perpendicular to another equation is always the negative reciprocal of the slope of the given equation

Answer 9

so if m=1/2
perpendicular is -2

Answer 10

to find the negative reciprocal, set your given * a variable = -1. For example, x*1/3 = -1; x = -1/(1/3) = -1 * 3/1 = -3

Answer 11

Hope this helps

Answer 12

its confusing when ur teacher doesnt even explain this in the first place

Answer 13

It is unfortunate that some teachers don't explain things well. Try going back to your textbook or check online for explanations. There are often very clear ones available.

Answer 14

i learned all of physics on wikipedia

Answer 15

lol

Answer 16

i think teachers explain how but not usually the why and that screws every1 over when they are attempting problems