6th grade Q3

An algebraic expression is a mathematical phrase that uses numbers, letters, and symbols, but it does not include an equal sign.

In the expression $3x+2y-10$, the letters $x$ and $y$ are variables. They can represent any number.

Let's look at how you can create an algebraic expression in a real-life situation. Imagine you have some candies, but you don’t know exactly how many because you haven’t counted them. Suppose you start with $x$ candies, and then you receive 21 more candies. The total number of candies you now have is $x+21$, which is an algebraic expression.

Now, consider another example. Imagine you have some money, though you don’t know the exact amount. Let's say you have $y$ dollars. If you spend 7 dollars, the amount of money you have left is $y-7$, which is also an algebraic expression.