The expression you've given, \( 4x + 5y \), is a linear algebraic expression in two variables: \(x\) and \(y\). Since no additional information or equation is provided (such as setting the expression equal to a number), it remains an expression rather than an equation to solve. Here are some things you can do with this expression:

1. **Simplify it** if there are additional terms, but as it stands, it's already in its simplest form.
2. **Evaluate it** if specific values for \(x\) and \(y\) are given.
3. **Graph it** if it's treated as part of a linear equation, like \(4x + 5y = 0\). This would represent a line on a Cartesian plane.

Do you have specific values for \(x\) or \(y\), or do you need help with anything else related to this expression?

### Related questions:
1. How do you evaluate \(4x + 5y\) for specific values of \(x\) and \(y\)?
2. How do you convert \(4x + 5y\) into an equation for graphing?
3. How can you solve \(4x + 5y = 20\) for \(x\) or \(y\)?
4. What are linear expressions, and how do they differ from quadratic ones?
5. How do you find the slope and intercepts from a linear equation?

**Tip**: When dealing with expressions involving two variables, it's often useful to evaluate or graph them by giving specific values to the variables.

Explore the linear expression 4x + 5y in algebra. Learn how to simplify, evaluate, and graph this expression using key algebraic concepts like the slope-intercept formula. This explanation is perfect for students in Grades 6-8, covering fundamental linear expressions and graphing techniques.

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