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2x+3y=510 ----------(1)
4x+2y=740 sacar mitad
2x +y =370 ------------ (2)
ahora 1 y 2
2x+3y=510 --------(1)
2x +y =370 multiplicamos por (-1)
-2x -y =-370 ---------------( 3)
ahora 1 y 3
2x +3y = 510
-2x -y = -370
2y = 140
2y=140
y=140/2
y=70 respuesta
en (2) hallamos "X"
2x +y =370 ------------ (2)
2x + y = 370
↓
2x + 70 = 370
2x=370-70
2x=300
x=300/2
x=150 respuesta