How do i do this. will give brainliest

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step-by-step explanation:

what i would say the best answer is a. 40.5

just sum

10 + 10 = 20

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