Answer:
EAFI
Explanation:
Since we know ∠A + ∠D = 90°, we can add the two equations together to get
90 = 7x + 6
Subtract 6 from both sides
84 = 7x
Divide both sides by 7 to get x = 12
Plug back into the equation to get ∠A = 36
Repeat for number 3, but this time the angles equal 180
Using the same steps as before, y = 3 and ∠C = 126
Put the letters together to get EAFI