Question

1°) classifique as retas r e s conforme suas propriedades relativas: a) ( r ) 2 x - y + 20 = 0    ( s ) 2 x - y + 1 = 0   

Answer 1

$(r) \\ -y=-2x-20~~\times(-1) \\ y=2x+20 \\ \\ (s) \\ -y=-2x-1~~~\times(-1) \\ y=2x+1 \\ \\ m=2\mapsto coeficiente~~angular \\ \\ como~~s\tilde{a}o~~iguais\mapsto~paralelas$