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Well done!
If I remember correctly, you homeschool your children? Do you teach them algebra when they were/are in elementary school?
You mean based on #819532?
No, I don't. I have a child in (public) secondary school now. I'm helping with math homework and test preparation.
It has been harder than I initially imagined, and sometimes frustrating, because of how different they teach math now compared to my own childhood. Instead of mastering one thing at a time, then building on top of that with the next, now they always do multiple new things at the same time, then re-iterating over topics later (trusting it will eventually sink in). Sometimes it's tricky for me to even understand the tasks, due to new language invented.
Thank you for sharing. I admire your conviction
Perimeter unshaded: 10−x+10+10+y
Perimeter shaded: x+y+10
Difference: −2x+20=12, so x=4
Area shaded A=(10∗x)/2=20