What is answer to 6x plus 20y plus 11 plus 17x-17y-4?

Answer 1

-- That's not an equation, so there's no question there, so there's no answer.

-- If it were an equation, then you'd need anotherequation in order to find the values

of 'x' and 'y'. You need the same number of equations as the number of variables

("unknowns", 'x' and 'y') in the equations.

-- The expression can be cleaned up, simplified, made to appear prettier:

6x + 20y + 11 + 17x - 17y - 4 = 23x + 3y + 7.

but that's not the answer to anything. It's just a neater way of writing the same expression.

Actually, it could be the answer to the question on a homework assignment

that says "Simplify the following expression:".