Can anyone explain. this to me ? step by step

She was supposed to put 10 in the variable for x to find the value of y (not the value of x twice). Circle the right part with the answer of x=9/2

Step-by-step explanation:

1. 2x+y=19

2. 2(10)+y=19

3. 20+y=19

4. 20+y=19

-20 -20

5. y=-1

10/60

step-by-step explanation:

if you divide 10 by 60 the answer is 0.166666 while if you divide or solve the other problems it equals 0.6