How to Do a Two-Step Subtraction Equation

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Doing a two-step subtraction equation is easy, so long as you start in the right place and take it slow. Do a two-step subtraction equation with help from a longtime mathematics educator in this free video clip.

Part of the Video Series: Principles of Math
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Video Transcript

Hi, I'm Jimmy Chang and we're here to talk about how to do a two-step subtraction equation. Now, when it comes to subtraction equations, those involving two steps more often than not when involve the subtraction operation itself and perhaps one other operation; so, let's do an illustration to see how this works. So, if you have the equation 3x minus 5, let's just say 20, the idea here is this is a subtraction equation because it involves subtraction and then in two steps, it, you can complete the equation in two steps. So, first, let's see how this works. Now, in this particular scenario, you want to take care of the subtraction part first and solve for x, which means you want to go with the opposite operation of subtraction which is going to be addition. So, get rid of the non x related terms, you're going to add 5 to both sides. So, you can have 3x is equal to 25, so that would be step number one. The second step is simply to solve for x. So, since the number three is multiplied with the x, you want to divide both sides by 3 and so x is going to be 25/3. And so, because it's just a two-step subtraction equation, you want to construct the equation so that it involves subtraction and one other operation and that will be it. So, I'm Jimmy Chang and that's a demonstration on how to do a two-step subtraction equation.

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