What must be true about the slopes of two perpendicular lines, neither of which is vertical?
imations
The slopes are equal.
The product of the slopes is -1.
One of the slopes must equal 0.
The product of the slopes is 1.

Use photo math it it’s so good

Look, when you want to do something like put it like x^2. x2 could mean x² or x₂. so to clear confusion, know the notation. to find the product multiply the x's and you get -8x and the y's and you get 6y. since it's all being multiplied it is just -8x6y, or answer a. although the better answer is -48xy(combining -8 and 6) because you should multiply constants whenever you can.