Arock is 7 feet below the surface of a river. if its position can be recorded as −7 feet, what would the position of 0 represent? on the surface of the river at the bottom of the river 7 feet above the surface of the river 7 feet below the surface of the river

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c