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Oksanka [162]
3 years ago
11

Solve the system of equations using the substitution method.

Mathematics
1 answer:
Katena32 [7]3 years ago
3 0
        4x+5y=7
         y=3x+9

1)      4x+5(3x+9)=7                 2)        y=3(-2)+9
                                                             y= -6 +9 
         4x+15x+45=7                               y=3                                                     
         19x+45=7
          19x= -38
             x= -2
x is -2 and y is 3
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