Mathematics
Grade6
Easy
Question
Find the value of the expression 3x + y where x and y are 2 and 3, respectively?
- 9
- 12
- 10
- 11
Hint:
This is an algebraic expression. An algebraic expression consists of two components: a variable and a constant. A variable is a quantity that doesn't have a fixed value. It takes value as per the given conditions. It is generally denoted by an alphabet. A constant is a quantity with a fixed value. In the given expression, a value is assigned to each of the variables, and we have to find the value after performing the operation between them.
The correct answer is: 9
The given equation is 3x+y.
Here, there are two variables and one constant. In the first term, the variable x is multiplied by a constant '3'. And between the two terms '3x' and 'y', we have a plus sign. The plus sign means we have to add the two quantities.
Now, in the given question, values are assigned to x and y. So, we have to substitute the values of x and y in the given expression and we have to do the operations.
As per the question, the value of x is 2 and the value of y is 3. Now we will replace x and y with given values as follows: 3x+y=3(2)+3
Solving further we get, 3x+y=6+3. And 6+3 adds to 9.
Therefore, the equation becomes 3x+y=9. So, option (b), which is '9', is the right answer.
The variables have the assigned value only in this question. Under different conditions they take different values.
