[Script Info]
Title:
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.01,0:00:06.86,Default,,0000,0000,0000,,Since point p is a point that is shared, by both the line, y equals 850, and the
Dialogue: 0,0:00:06.87,0:00:13.48,Default,,0000,0000,0000,,line y, equals 10x plus 150, both of these lines have the same y value at that
Dialogue: 0,0:00:13.49,0:00:20.60,Default,,0000,0000,0000,,point. Since the y value of y equals 850 is always 850, that means that this the
Dialogue: 0,0:00:20.61,0:00:28.12,Default,,0000,0000,0000,,y value of 10x plus 150 at point p. So, we just need to substitute 850 into the
Dialogue: 0,0:00:28.13,0:00:36.12,Default,,0000,0000,0000,,spot of y, in the second equation. That gives us a single equation of 850 equals
Dialogue: 0,0:00:36.13,0:00:44.02,Default,,0000,0000,0000,,10x plus 150. And yes, x is the only variable in this equation.