# graph problem..

• Sep 12th 2009, 07:53 AM
kachun135
graph problem..
Stats whether they are parellel perpendicular or neither by working out the gradients....

i) y= -4 x= 2

i have a general idea that the formula y=mx-c is involed, or am i wrong ?Also, how do i solve this question ?
• Sep 12th 2009, 07:56 AM
e^(i*pi)
It is involved but you have only one line...

for parallel lines m is the same

for perpendicular lines $m_1m_2 = -1$
• Sep 12th 2009, 08:13 AM
kachun135
so how can i solve it...because thats all its given in the question :(