According to the mathematical question, the correct answer is: 5x + 3y or (3y + 5x)
The question is a fractional part of a mathematical topic called: addition and subtraction of number with two or more variables.
In mathematics, a variable is a letter or symbol, such as "x", "z," or "y" that represents a value.
Addition is denoted by the sign + while the subtraction is denoted by the sign (-).
The operation of addition and subtraction of numbers with variables are to be treated like the ordinary numbers. As a result, any answer given by the addition or subtraction of these numbers with variable, must take the variables.
But, since we have only two variables (x, y) in the question
2x + 7y + 3x - 4y (simply bring those that are of same variables together first.)
This implies
2x + 3x + 7y - 4y (then add and subtract numbers with same variables respectively, starting with 2x +3x)
2x + 3x = 5x (it is seen that the addition of 3x + 2x gives 5x)
7y - 4y = 3y (the subtraction of 7y and 4y gives 3y). The reason for such answer is because +7y is still the same thing as 7y, and 4y is subtracted from it.
Therefore,
2x +7y + 3x - 4y = 5x + 3y (That is the final answer)
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