Pi is the ratio of the diameter to the circumference
circumference/diameter=pi
that's why c=pid or c=2pir
some digits are <span>3.14159265358979323846264338327950288419716939
937510582097494...</span>
4x=8
This is because when you add the two expression together 2x+2x=4x the y values cancel and -4+-4=-8
4x-8=0 is equivalent to 4x=8
1)slope=5/3 y-intercept=-4
2)slope=4/7 y-intercept=3
3)slope=undefined y-intercept=-5
