Pretty easy but i didn't listen to the course.

Your question: Please help. Pretty easy but I didn't listen to the course.

For next time: Sometimes people on can't get to every answer quick enough, which means you're left confused!  In order to figure out this question, all you have to do is enter in each equation; if they don't equal eachother, it's not the answer!

Such as: Enter a^2+3b-2a^2 (First part of the expression) Then, enter in the second part: 3a^2+3b-4a^2 (Which is after the equal/= sign.)

Good luck, mate!

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