The value of 9−y is twice the value of y. What is the value of y?

y = 3

Step-by-step explanation:

9 - y = 2y

Step 1:  Add y to both sides

9 - y + y = 2y + y

9 = 3y

Step 2:  Divide both sides by 3

9 / 3 = 3y / 3

3 = y

 y = 3

sorry i dont know my friend

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step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.