The lowest grade on the algebra test was 48. We decided that l would be the number, so we have l = 48. Step 6: Answer the question in the problem The problem asks us to find the lowest grade. In terms of our variable, Step 5: Solve the equation. So, (highest grade) + (lowest grade) = 142. We also know that the highest grade added to the lowest grade is 138. That means we need to add 42 to the lowest grade. Whatever the lowest grade is, we are told that the highest grade is 42 points higher than that. Let l = the lowest grade Step 4: Write an equation. Step 3: Write down what the variable represents. Step 2: Assign a variable for the lowest test grade. Step 1: What are we trying to find? The lowest grade on an algebra test.
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