bri1300 bri1300
  • 26-10-2020
  • Mathematics
contestada

X + 2y = 7
2x + y = 5
What’s the substitution

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TREKKER
TREKKER TREKKER
  • 26-10-2020

You can subtract 2y from both sides of the first equation and then plug that (x = 7 -2y) into the second one to get:

14 - 4y  + y = 5 -->

14 - 3y = 5 -->

-3y = -11 -->

y = 11/3 -->

x = 2/3

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