diff --git a/education/math/Systems of Equations.md b/education/math/Systems of Equations.md
index 45243a7..d5f464d 100644
--- a/education/math/Systems of Equations.md	
+++ b/education/math/Systems of Equations.md	
@@ -25,4 +25,4 @@ $$ 4x -3y = -13 $$
 You "add" the two equations together, getting:
 $$ 6x + 0y = 10 $$
 You now know that $6x = 10$.
-If you don't have two values that evenly cancel out, like $3$ and $4$, you can find the least common multiple and multiply the entire equation so that those two are equal. In this case, you'd multiply one equation by 4, and one equation by 3.
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+If you don't have two values that evenly cancel out, like $3$ and $-4$, you can find the least common multiple and multiply the entire equation so that those two are equal. In this case, you'd multiply one equation by 4, and one equation by 3. If the signs don't cancel out, you can multiply one of the equations by -1.
\ No newline at end of file