How do you solve using the substitution method? 9x+7y=-47 -3x+y=19

⚑ Flag

Define one variable in terms of the other variable. For example: -3x+y=19         y=3x+19 Then, plug that value into the other equation. 9x+7y=-47 9x+7(3x+19)=-47 Solve. 9x+21x+133=-47 30x+133=-47         30x=180             x=6 Plug that value back in to find the other variable. -3x+y=19 -3(6)+y=19   -18+y=19          y=37 Solution: (6,37)