Question

which equation represents the model?
21 + 4x = 61
what is the value of 4x?
21 + 4x = 61
4x = \square
(and an image of a bar model with 21 and four x segments totaling 61)

Explanation:

Step1: Start with the given equation

We have the equation \(21 + 4x = 61\).

Step2: Isolate \(4x\)

To find the value of \(4x\), we subtract 21 from both sides of the equation. Using the subtraction property of equality, if \(a + b = c\), then \(b = c - a\). So, \(4x=61 - 21\).

Step3: Calculate the result

Calculate \(61-21 = 40\). So, \(4x = 40\).

Answer:

\(40\)