Question

Metodo de sustitución
2x+3y=5
2x - y =9

Answer 1

1.-
2x=5-3y
x= 5-3y/2


2.-
2x-y=9
2(5-3y/2)-y=9 se simplifican los "2"
5-3y-y=9
5-4y=9
-4y=9-5
-4y = 4
Y= -1


2x + 3y = 5
2x + 3(-1) =5
2x -3 =5
2x= 5+3
x = 8/2
x = 4



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