Answer:
y = 5
Step-by-step explanation:
All angles must add up to 90° as you can see the right angle symbol, this means:
51 + 9y - 6 = 90
51 - 6 + 9y = 90
45 + 9y = 90
Subtract 45 from both sides of the equation to isolate the 9y:
45 + 9y - 45 = 90 - 45
9y = 45
Divide both sides by 9:
[tex]\frac{9y}{9} = \frac{45}{9}[/tex]
y = 5
Hope this helps!
