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5x+9y=17
sustituimos y=7-2x en la segunda ecuacion:
5x+9y=17
5x+9(7-2x)=17
5x+63-18x=17
5x-18x=17-63
-13x= -46
x= -46/-13
x= 46
13
si x=46/13
2x+y=7
2(46)+y=7
13
92 + y=17
13
y=7- 92
13
y= - 1
13
la solucion es:
x=46/13 y= -1/13