# How do you solve the system # -7x+y=-19# and #-2x+3y=-19#?

##### 1 Answer

Graphically:

#### Explanation:

There's two ways in which we solve systems in general: elimination, and substitution.

We'll be using substitution to solve this system. Why? Notice that we have a single

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Step 1: Solve for One Variable

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Let's first write out our equations:

(1)

(2)

Now, we solve for one variable. I'm going to solve for

As you can see, that was pretty easy, and gave us a relatively nice result. This is why we chose to do substitution for this particular problem.

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Step 2: Plug into Other Equation; Solve for Other Variable.

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Now, let's plug in the value for

Foil:

*Note: Watch your signs while you do this*

Combine like terms:

Isolate

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Step 3: Solve for First Variable

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We could plug this value we found for

So, our final solutions are

You can see this graphically below. The red line is equation (1) and the blue line is equation (2):

Hope that helped :)