grothhailey grothhailey
  • 12-06-2022
  • Mathematics
contestada

solve using substitution, 5x+y=9 10x-7y=-18

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jsimpson11000 jsimpson11000
  • 12-06-2022

Answer:

See below

Step-by-step explanation:

5x + y = 9      re-arrange  to    y = 9-5x  

   use this value of 'y' in the second equation:

    10x - 7(9-5x) = - 18

       solve for x = 1

  sub in this value of 'x' into one of the equations to compute 'y'

5 (1) + y = 9

  y = 4

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