Solving Equations: Single Variable
Solving Equations: Single Variable
Goals for this section:
Goals for this section:
I can solve equations for a single variable.
I can solve equations for a single variable.
Tips
Tips
Whatever you do on one side of the equation, you must do on the other side as well!
Whatever you do on one side of the equation, you must do on the other side as well!
This is to "balance" the equation.
This is to "balance" the equation.
Examples:
- If you add 2 on one side, you must do on the other.
- If you divide on one side, you must divide ALL TERMS on the other side.
Draw a "separating" line through the equals sign.
Draw a "separating" line through the equals sign.
Whenever we want to move a term to the other side of the line, we must do the opposite math operation.
Whenever we want to move a term to the other side of the line, we must do the opposite math operation.
- Addition is the opposite of subtraction
- Multiplication is the opposite of division
- "Power of 2" or "squared" is the opposite of "square root"
Take one step at a time!
Take one step at a time!
At each line, make sure to bring every other term down, including the equals sign.
At each line, make sure to bring every other term down, including the equals sign.
Oftentimes, students might make a mistake because they're not clearly writing their steps down. It helps to pinpoint where mistakes might have happened if we write down each step.
If we have x variables on BOTH sides of the equation and they have the same degree, then combine them.
If we have x variables on BOTH sides of the equation and they have the same degree, then combine them.
This means that one of the x-terms will need to be moved across the line.
This means that one of the x-terms will need to be moved across the line.
Isolate x. Always start with the "farthest" term/operation.
Isolate x. Always start with the "farthest" term/operation.
Start "moving" terms and operations to the other side to make x alone.
Start "moving" terms and operations to the other side to make x alone.
This means that everything that's on the same side as the variable x needs to be moved to the other side.
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This is a video that can help understand the concept a bit more about solving linear equations.