It would be 6x + 6y as the final expansion
To find the area of a square is Base x Height.
Triangle is 1/2 base x height.
Y + 8.3 = 12.7.....subtract 8.3 from both sides
y + 8.3 - 8.3 = 12.7 - 8.3...simplify
y = 4.4 <===
u can also check ur answer...
4.4 + 8.3 = 12.7
12.7 = 12.7 ...correct