Solving 2-step equations ax + b = c. Keep it balanced Just like when solving a one- step equation keep it balanced. Just like when solving a one- step.

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Presentation transcript:

Solving 2-step equations ax + b = c

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

So what do we do first? In the equation In the equation 2x + 4 = 12 2x + 4 = 12 Our first step will be to subtract the 4 from each side of the equation. Our first step will be to subtract the 4 from each side of the equation.

Step 1: 2x + 4 = 12 2x + 4 = = = -4 2x = 8 2x = 8 Now we have a one-step equation.

Step 2: Divide by both sides by 2 2x = x = 4 x = 4

Now you try one 2x + 5 = 15 Which operation should you do first? Subtract the 5 first Subtract the 5 first

2x + 5 = 15 What should your second step be? Divide by 2

So what was your answer? 2x + 5 = = = -5 2x = 10 2x = x = 5 x = 5

What if there is division in the equation? X - 6 = 25 4 What is your first step? Add the 6 to each side

What is your second step? X - 6 = 25 4 Multiply by 4

So what is your answer? X - 6 = = = + 6 x = 31 x = 31 4

Now multiply by 4 4* X = 31 * 4 4* X = 31 * 4 4 x = 124 x = 124