Solve the proportion do not include the variable a -5/12 equals a + 2 / 5

i got 10.28 but that rounds up to 10.3

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