How many intersections do you expect from four straight lines ? Which three lines enclose a triangle with negative co-ordinates for every point ?
Four straight lines have the following equations:
3x+8y=59
x−2y=1
y−4x=3
3y+2x= −19
How many points of intersections do you expect there to be?
Three of the four lines enclose a triangle which only has negative co-ordinates for all points on that triangle.
Which three lines?
Age 14 to 16