Which equation can you use to find the value of x?

3x = 78+x-2

Step-by-step explanation:

The exterior angle of a triangle is equal to the sum of the opposite interior angles

3x = 78+x-2

3x = 78+x-2

Step-by-step explanation:

Remember that the inner angles of triangles always add up to 180, so 78º +(x-2) + third angle=180º.

And the third angle and the 3x angle are suplemmentary, meaning that they add up to 180 so it would be 3x+ third angle=180

Since both are equal to 180, we can equalize them in an equation:

3x+third angle=78º+(x+2)+thirdangle

Since third angle is in both sides adding up we can eliminate it and the equation would look like this:

3x=78º + (x-2)

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