To match the number with the opposite, we are flipping the sign. If the sign is originally a negative, it would become a positive, and vice versa.
Term: 3.2 Match (Opposite): B) - 3.2
Term: -2.3 Match (Opposite): D) 2.3
Term: -1.5 Match (Opposite): C) 1.5
Term: 5.1 Match (Opposite): A) -5.1
~
It should be the point of tangency.
Your going to want to first distribute the negative out to the second equation
65x+50y-16x+21y
49x+71y
We need to see the graph in order to answer