A photo is 4 inches wide. It is placed inside a frame with a border that is x inches wide. The total width of the photo and the frame is 7 inches. Write an equation to model the situation, then solve the equation to find the width of the border.()

Answer 1

Let's call the width of the border x inches.
Since the total width of the photo and the frame is 7 inches, and the photo is 4 inches wide, the width of the frame must be (7 - 4) = 3 inches.
Therefore, the equation to model the situation is:
4 + 3x = 7.
To solve the equation, we can subtract 4 from both sides:
3x = 3.
Finally, we can divide both sides by 3 to solve for x:
x = 1.
Therefore, the width of the border is 1 inch.