Lucy has some pennies and some nickels. She has a maximum of 15 coins worth a minimum of $0.47combined. If lucky has 6.999999999999999 nickels, determine all possible values for the number of pennies that she could have.

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