Question

resposta explicativa passo a passo, por favor?

Answer 1

$s: y=\dfrac{1}{2}x\\ \\ \\ \text{ent\~ao }r:y-y_0=-2(x-x_0)\to~y-10=-2(x-20)\\ \\ r: y=-2x+50\\ \\ \\ \text{necesitamos do ponto C}\\ \\ \\ C=(0,\gamma)\in r\to \gamma=50\\ \\ \\ \left[APC\right]=\dfrac{20\times50}{2}=500$