Question

x,y,z direct proprtional cu 2,3,5 .2x+y+5z=81

Answer 1

x/2=y/3=z/5=k
×=2k
y=3k
z=5k
si inlocuiesti in relatie

Answer 2

{x,y,z{d.p. {2,3,4}

x/2 = y/3 = z/4 = k
x = 2k  ; y = 3k  ; z=4k

2x + y + 5z=81
 
2×2k + 3k + 5×4k = 81

27 k = 81⇒ k = 3

x = 2×3 = 6;  y = 3×3 = 9  ; z = 4k = 4×3 = 12

x = 6 , y = 9  si z = 12