Answer:
The answer is 7(5x+4y)
Step-by-step explanation:
Well you would have to first find what number is able to go in both numbers.
7 can go into 35 by 7·5
7 can also go into 28 by 7·4
So now we would simplify this by putting this in a distributive equation.
If you have any questions feel free to ask in the comments - Mark