The first one ,to substitute 3xy from -16 ...so divided both side by 3 .so, (xy =-5.33). the second one,5xy =-20. so,divided both sides by 5 so xy = -4....
Let, the missing number = x
Then, 7/35 = 28/x
1/5 = 28/x
x = 28 * 5
x = 140
In short, Your Answer would be Option B
Hope this helps!
Answer:
you plus them together then you get 42 out of your number you close during / N which is 3 to get your final answer thank