SOLUTION: Haven't taken Algebra in 20 years and I am struggling already in my first week. Could someone explain this problem to me step by step so I might get it: Use substitution method

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Question 335713: Haven't taken Algebra in 20 years and I am struggling already in my first week. Could someone explain this problem to me step by step so I might get it:
Use substitution method to solve:
2x+7y=48 (1)
x= 28-4y (2)
This is what I think:
If I know that X= 28-4y do I plug that into the 1st equation? 2(28-4y) + 7y =48 ??
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Yes, then solve for y.
Once you have y then go back to eq. 2 and solve for x.