How do you solve systems of equations by substitution

You arrange one of the equations to equal y or x and then plug that equation in for the variable of the other equation.

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step-by-step explanation:

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m∠5 + m∠3 = m∠1   is true.

m∠5 + m∠6 = 180 is true

m∠2 +m∠3 = m∠6   is true

m∠2 +m∠3 +m∠5 = 180   is true