Question 1

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Considera les rectes d'equacions:
begin mathsize 12px style bold r bold space bold identical to open curly brackets table row cell bold x bold equals end cell cell begin bold style negative 5 end style bold plus begin bold style 2 end style bold times bold k end cell row cell bold y bold equals end cell cell begin bold style negative 3 end style bold plus begin bold style negative 4 end style bold times bold k end cell end table close curly brackets bold space
bold s bold space bold identical to bold space begin bold style negative x plus 2 times y plus 1 equals 0 end style bold space end style

a) Calcula el producte escalar dels seus vectors directors

b) Esbrina si són perpendiculars: S per si, N per no.

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