Question 133951
you have the right equations...just substitute


substituting 2nd equation into 1st __ 1/x+1/9=1/6
__ multiplying by 18x __ 18+2x=3x __ 18=x


substituting 3rd equation into 1st __ 1/y+1/8=1/6
__ multiplying by 24y __ 24+3y=4y __ 24=y


substituting __ 1/18+1/24+1/z=1/6
__ multiplying by 72z __ 4z+3z+72=12z __ 72=5z __ 14.4=z