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## Answers

D =

=3(-7+16)-4(14-40)+5(-4+5) = 136

Dx =

=18(-7+16)-4(91-160)+5(-26+20) = 408

Dy =

=3(91-160)-18(14-40)+5(40-65) = 136

Dz =

=3(-20+26)-4(40-65)+18(-4+5) = 136

Therefore x = Dx/D = 408/136 = 3

y = Dy/D = 136/136 = 1

z= Dz/D = 136/136 = 1