## Algebra 1

Each side of the diagram represents one side of the equation. The bar separating the two sides represents the equal sign. The left side of the equation is $x+4$. - A green tile represents a variable such as x. The left side of the diagram will include one green tile since the implied coefficient of x is 1. - The left side will also include 4 yellow tiles. Each yellow tile represents +1, so adding 4 is represented by 4 yellow tiles. The right side of the equation is "7". - A yellow tile represents +1, so 7 is represented by 7 yellow tiles. Use the addition property of equality to add 4 red tiles to both sides of the line. Remove the resulting 4 zero pairs from each side. $x+4=7\longrightarrow$ subtract 4 from both sides $x+4-4=7-4\longrightarrow$ subtract $x=3$