Four straight lines have the following equations

  1. \(3x+8y=59\)
  2. \(x-2y=1\)
  3. \(y-4x=3\)
  4. \(3y+2x=-19\)

How many intersections do you expect?

Some more points…

Three of the four lines above will enclose a triangle where each point on the triangle has negative coordinates.

Which three lines?

Once you have answered these, you will be ready to move to the main problem.