Question

What is point "R" and how do I do point "R"

Answer 1

One line goes straight up the other one is horizontal

Answer 2

Take 2 lines on a graph. One going straight up, one going horizontal. Point R is where both MN and PQ meet. Example: If MN was on the Y axis, and PQ was on the X axis. Then point R would be (0,0) on the graph.