mat116
posted by Anonymous .
Can you please look over these and let me know if they are right?
1/4(5x1/2)5/3<1/3 I got {xx<51/30}
31(2x+2)< or equal to 4(x+1)+x I got {xx>equal to 3.6}
Use elimination method: 4x+5y=12 and 7x5y=76 I got x=8 and y=4
elimination: 0.3x0.2y=4 and 0.4x+0.5y=1 I got the solution of (220/23,130/23)

"1/4(5x1/2)5/3<1/3 I got {xx<51/30} "
51/30 needs to be simplified, otherwise correct.
"31(2x+2)< or equal to 4(x+1)+x I got {xx>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 7x5y=76 I got x=8 and y=4 "
correct!
"0.3x0.2y=4 and 0.4x+0.5y=1 I got the solution of (220/23,130/23) "
correct!