Robert is making pink paint by mixing red and white paint in the ratio 1:3. Red paint costs £5 for 500ml. White paint costs £8 for 3 litres. Plain tiles 40p ea Work out how much it will cost Robert to buy enough paint to make 12 litres of pink paint.

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