Solving 2-step equations

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Presentation transcript:

Solving 2-step equations Chapter 7.3

Each one has 4 squares, so 4 is your answer! Modeling - 2x + 3 = 11 = Each one has 4 squares, so 4 is your answer!

Solving 2-Step Equations Algebraic equations are solved backwards, so do the OPPOSITE math! Since there are more than 1 steps to do you must follow the Order of Operations…but BACKWARDS!!! Add/Subtract 1st Multiply/Divide 2nd

3y – 8 = 7 1st ADD 8 to both sides so he cancels out! + 8 +8 3y = 15 2nd DIVIDE by 3 to both sides so he cancels out! /3 /3 y = 5 Now the y is alone and you can plug the answer back in to CHECK your work!

9 + 6b = 51 1st SUBTRACT 9 to both sides so he cancels out! -9 -9 6b = 42 2nd DIVIDE by 6 to both sides so he cancels out! /6 /6 b = 7 Now the y is alone and you can plug the answer back in to CHECK your work!

y/2 + 2 = 10 1st SUBTRACT 2 to both sides so he cancels out! -2 -2 y/2 = 8 2nd MULTIPLY by 2 to both sides so he cancels out! x 2 x 2 y = 16 Now the y is alone and you can plug the answer back in to CHECK your work!

1st SUBTRACT 1.8 from both sides so he cancels out! -1.8 - 1.8 7s = 14.0 2nd DIVIDE by 7 to both sides so he cancels out! / 7 / 7 s = 2 Now the y is alone and you can plug the answer back in to CHECK your work!