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Teaching video of mathematical linear function
(1) let l be y=2x+a, and substitute it into point p, 4=2+a, and a=2.

y=2x+2

(2) A(0,2),B(- 1,0)

M: y=2x+t, then c (-t/2,0)

BC = |- 1-(-t/2)| = | t/2- 1 |

OA=2

s = BC * OA/2 = | t/2- 1 | * 2/2 = | t/2- 1 |

When t/2- 1 >: 0, t>2, S=t/2- 1.

When t=2, s = 0.

At t<2, S= 1-t/2.