# 6.12: Equations with Letters

**Equations with Letters - Write and Solve Equations**

**Teacher Notes**

Students are presented with three scales, their contents, and their weights. They represent relationships shown in the scales by writing equations using letters to represent unknown weights of blocks. In the next section, they solve sets or systems of equations without pictures. It is in this section that students represent sets of the same type of block as a product rather than as a sum (e.g., *instead of* ).

**Solutions**

Write equations. Figure out the weights of the blocks.

Eric wrote these equations from pictures of blocks on scales.

Use Eric’s equations. Find the weight of each block.