Question

The equation, in general form, of the line that passes through the point (2,9) and is perpendicular to the line 4 x + 9 y + 1 = 0 is Ax + By + C = 0, where
A =
B =
C =

Answer 1

can you find slope of 4 x + 9 y + 1 = 0 ?

Answer 2

ya i know how to fine the slop

Answer 3

so whats the slope of that line ?

Answer 4

isent it -4/9

Answer 5

correct!
now perpendicular line have product of slopes = -1

Answer 6

so,
m * (-4/9) = -1
m=... ?

Answer 7

9/4?

Answer 8

correct!
m = 9/4
x1 =2
y1 =9
can you find the equation ?

Answer 9

y-y1 = m (x-x1)
slope point form

Answer 10

it would be Y=9/4x+9/2

Answer 11

yes,
to eliminate the fraction, multiply 4 on both sides

Answer 12

that would make it 4y=9x+18

Answer 13

oh i got it thank you

Answer 14

correct
now to get that form, just subtract 4y from both isdes...

ohh, welcome ^_^