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U Try Show why the point is not a solution to the system ( -2,9) 5x + y = -1 6x + 2y = 4 Algebra 1 Chapter 6 Section 2 Solving Systems of Equations by Substitution Solution • A set of coordinates that make all of the equations in a system true So x in equation 1 = x in equation 2 & y in equation 1 = y in equation 2 y = 2x - 7 y = -3x + 8 Sometimes you must solve 1 equation for 1 variable 3x + y=2 4x + y = 20 Gym Membership You want to join a Gym • Workoutz gym charges a joining fee of $150 and charges $35 a month • Fitness Galaxy Gym has no joining fee, but charges $60 a month When will both Gyms cost the same amount? Do Now! • Due in 10 min page 394 1 – 11 odd Due tomorrow Page 394 13 – 23 odd