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Solving Systems of Equation by Substitution
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Objective To be able to solve a system of equations by substitution.
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Substitution Since x = 2 We can now substitute it back in.
y = 3x (the 1st equation) y = 3(2) -1(put in the x value) y = (solve for y) y = (2,5) is the solution
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Substitution y + 1 = x (the 2nd equation)
Since y = 1 Now substitute y + 1 = x (the 2nd equation) 1 + 1 = x (put in the y value) 2 = x (solve for x) (2,1) is the solution
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Solving for x or y First solve for x or y
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3(-2y + 4) + 5y = 14 -6y y = 14 -y + 12 = 14 -y = 2 y = -2
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Solving Systems of Equation by Substitution
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