Question

decide whether the lines with the equations y=2x-1 and y=-2x+1 are perpendicular?

Answer 1

can you find the slope of those lines ?

Answer 2

isn't it 2x?

Answer 3

for y=mx+c
the slope is just "m"
not mx

Answer 4

so for y=2x-1, the slope =... ?

Answer 5

2

Answer 6

correct!
and whats the slope of y=-2x+1 ???

Answer 7

-2

Answer 8

good :)
now for lines to be perpendicular , the product of their slopes must be -1 !!

so, here, is the product = -1 ??

Answer 9

no

Answer 10

correct, because 2*-2 =-4 and not -1
so, the lines are NOT perpendicular, got it ?

Answer 11

yep, thanks

Answer 12

welcome ^_^