does the point (1,3) lie on the line y=-2x+7
x squared + 16 = 0
5 x square + 5 = 0
2x+4=1
1612,9=50/(50/x)*1,24
62.5*10^-9*x=0.05
50x+2=0
1. Show that (x+y)² + (x-y)² = 4xy
