2х+7у

To prepare for university exams, it's important to have a good understanding of algebraic expressions. In your case, the expression is 2х+7у.

This is a linear expression with two variables, х and у. The expression consists of two terms: 2х and 7у. The coefficient of х is 2, and the coefficient of у is 7.

To simplify or evaluate this expression, you need to know the values of х and у. Once you have the values, substitute them into the expression and perform the necessary calculations.

For example, if х = 3 and у = 5, the expression becomes:

2(3) + 7(5) = 6 + 35 = 41

So, when х = 3 and у = 5, the value of the expression 2х + 7у is 41.

Make sure to practice solving similar expressions and understand the properties of algebraic operations to excel in your university exams.