Question

(fuvest-Sp) (x+2y+3z=4 4y+5z=23 6z=18 então, X é igual A:
A) 27
B) 3
C) 0
D) -2
E) 1

Answer 1

6z= 18 ∴z=18/6=3 4y +5z= 23∴4y + 5.3=23∴4y+ 15=23 4y= 23-15∴4y = 8∴y=8/4=2 x+2y+ 3z= 40∴x +2.2+3.3= 40 x+ 4 +9=40∴x= 40-13=27