Question

y=mx+b; solve for m

Answer 1

sub. b from both sides
y-b=mx
divide x to both sides
y-b/x=m

Answer 2

m=(y-b)/x

Answer 3

m=(y-b)/x

Answer 4

y-b=mx, y-b/x=m

Answer 5

m=(y-b)/x

Answer 6

Start with (a - b)^2 ≥ 0
==> a^2 - 2ab + b^2 ≥ 0
==> a^2 + b^2 ≥ 2ab
==> (1/2)(a^2 + b^2) ≥ ab