Can you please look over these and let me know if they are right?

Question

1/4(5x-1/2)-5/3<1/3 I got {x|x<51/30}

31-(2x+2)< or equal to 4(x+1)+x I got {x|x>equal to 3.6}

Use elimination method: 4x+5y=-12 and 7x-5y=-76 I got x=-8 and y=4

elimination: 0.3x-0.2y=4 and 0.4x+0.5y=1 I got the solution of (220/23,-130/23)

Answer 1

"1/4(5x-1/2)-5/3<1/3 I got {x|x<51/30} "
51/30 needs to be simplified, otherwise correct.

"31-(2x+2)< or equal to 4(x+1)+x I got {x|x>equal to 3.6} "
3.6 is almost right, I get 3 4/7.
Since the answer can be expressed in a fraction, there is no reason to use decimal approximation.

"Use elimination method: 4x+5y=-12 and 7x-5y=-76 I got x=-8 and y=4 "
correct!
"0.3x-0.2y=4 and 0.4x+0.5y=1 I got the solution of (220/23,-130/23) "
correct!