Question

(x,y,z)d.p(12,13,15)
x3+5y-z

Answer 1

[tex] \frac{x}{12} = \frac{y}{13} = \frac{z}{15} =k\\ =\ \textgreater \ \frac{x}{12} =k=\ \textgreater \ x=12k\\ =\ \textgreater \ \frac{y}{13} =k=\ \textgreater \ y=13k\\ =\ \textgreater \ \frac{z}{15}=k=\ \textgreater \ z=15k\\\\ 3*x+5y-z=3*12k+5*13k-15k=36k+65k-15k=\bold{86k}\\\\ [/tex]