Which expressions equal 9 when x = 4 and y = 1/3? Select ALL that are correct.
2x + 3y
5 (x/2) - 3y
3x - 9y
x^2 + 6y
y^2 - 21x

for this case we must apply distributive property to the following expression:

the distributive property states that:

then, when applying the property we have to multiply the -2 for each term within the parenthesis:

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