Question

which equation does this set of algebra tiles represent?
x + 1 = 4, x + 5 = 4, x + 5 = 9, x + 1 = 9

Explanation:

Step1: Count tiles on left

Left side: 1 \( x \) tile + 5 unit tiles (\( 1 \)s). So left is \( x + 5 \).

Step2: Count tiles on right

Right side: 9 unit tiles (\( 1 \)s). So right is \( 9 \).

Step3: Form equation

Left = Right → \( x + 5 = 9 \).

Answer:

\( x + 5 = 9 \) (the third option: \( x + 5 = 9 \))