Algebra 2

Using Equations

The second angle of a triangle is three times the first and the third is 12 degrees less that twice the first. Find numbers for angles.

I do not understand how to solve this equation.

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  1. Let A, B and C be angles 1, 2 and 3.

    Then, B = 3A and C = 2A - 12

    Since the problem states that we are dealing with a triangle, we know that A + B + C = 180º

    Substitute for B and C and solve.

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