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Algebra 1 Section 7.2 Solve linear systems by substitution Solve by substitution y=x–4 4x + y = 26 To solve a system by substitution 1. Solve one equation for one variable 2. Substitution the expression into the other equation 3. Solve the equation for the 1st variable. 4. Substitute and solve for the 2nd variable Solve by substitution x – 2y = -25 3x – y = 0 3w – 2u = 12 w – u = 60 Solve 7g + h = -2 g – 2h = 9 • Page 409 ex 43 Assignment Page 408 Problems 18 – 34 even 42,44,60,63