coolblue101
coolblue101 coolblue101
  • 13-04-2017
  • Mathematics
contestada

need help pls solve 7x-4y=-7 5x+y=22

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Аноним Аноним
  • 13-04-2017
7x-4y=-7
5x+y=22

multiply 4 on the 2nd equation
20x+ 4y=88

now you have
7x -4y = -7 
20x + 4y = 88
--------------------add
27x = 81
x = 3

7x-4y=-7
7(3)-4y=-7
-4y = -28
y = 7

answer (3, 7) is the solution
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ethanpace69
ethanpace69 ethanpace69
  • 13-04-2017
i think this would be the correct answer {x,y} = {3,7} 
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