What is blank divided by 4 equals 9

For this case, the first thing we are going to do is define a variable.

We have then:

x: unknown number

We now write the expression that models the problem:

From here, we clear the value of x.

We have then:

36 divided by 4 equals 9

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