Which is a better buy 1 lb of butter at $3.00 or 12oz. of butter at $2.50
1 answer:
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ANSWER
The two lines are perpendicular if
EXPLANATION
Given two lines:
and
We can tell wether these two lines are perpendicular to each other using their slopes.
If the product of their slopes is -1, the then the two line are perpendicular.
For example:
The line
has slope
and the line
has slope
The product of the two slopes is
This implies that:
Therefore the two lines are perpendicular.