Solving 2-step equations

1
Solving 2-step equations

• ax b c

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Keep it balanced

• Just like when solving a one-step equation keep
  it balanced.
• Save the co-efficient until last.

3
So what do we do first?

• In the equation
• 2x 4 12
• Our first step will be to subtract the 4 from
  each side of the equation.

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Step 1

• 2x 4 12
• -4 -4
• 2x 8
• Now we have a one-step equation.

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Step 2

• Divide by both sides by 2
• 2x 8
• 2 2
• x 4

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Now you try one

• 2x 5 15
• Which operation should you do first?
• Subtract the 5 first

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2x 5 15

• What should your second step be?
• Divide by 2

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So what was your answer?

• 2x 5 15
• - 5 -5
• 2x 10
• 2 2
• x 5

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What if there is division in the equation?

• X - 6 25
• 4
• What is your first step?
• Add the 6 to each side

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What is your second step?

• X - 6 25
• 4
• Multiply by 4

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So what is your answer?

• X - 6 25
• 4
• 6 6
• x 31
• 4

12
Now multiply by 4

• 4 X 31 4
• 4
• x 124