Robert took out an 80/20 mortgage to buy a $100,000 house. The first (80%) mortgage has an interest rate of 4.75%, and the second (20%) mortgage has
an interest rate of 7.525%. Both mortgages are 30-year fixed-rate mortgages.
What is the total mortgage payment for this house?
O A. $140.19
O B. $557.51
O C. $439.87
O D. $417.32

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step-by-step explanation:

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

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step-by-step explanation:

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