1.
(2³ ·3⁴)/(-3²·2²)=(5·3²·2)/x
-2 ·3²=5·3²·2/x
-1 =5/x
x=-5
2
x/3=y/4=z/5 y=4x/3 z=5x/3
a) x+y+z=24
x+4x/3+5x/3=24
3x+4x+5x=72
12x=72 x=6 y=4*6/3=8 z=5*6/3=10
b) 2x+3y+4z=76
2x+3*4x/3+4*5x/3=76
6x+12x+20x=228
38x=228
x=6 y=4*6/3=8 z=5*6/3=10
c) y-z=3 y=3+z
x/3=y/4=z/5 (3+z)/4=z/5 15+5z=4z z=-15 y=-15+3=-12 x=3*(-15)/5=-9