I adore combining like terms! :)
First, let's combine x's:
2x-2x cancel out to 0
Now y's:
-4y
And now numbers or constants:
-4-6=-10
Now write all the terms together:
-4y-10
Hope it helps!
*Just a girl who adores Brainly and listens to "Try Everything"

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Additional Comment:
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Answer:
156 yards
Step-by-step explanation:
1 yd = 3 ft
So if 1 yd is equal to 3 ft then all you need to do is divide the amount of ft given by the amount that makes 1 yd
I hope this helps you
x^2-6x+9=0
(x-3)^2=0
x=3