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-24x+21y= 51
8)(3x-3y=-3)
24x-24y= -24
-3y=27
y=-9
3x-3(-9)= -3
3x+27= -3
3x=-30
x=-10
8x+17=7y
8x+17/7 = y
2º 3x-3y= -3 sacas tercia a cada uno
x-y=-1 tratas de poner en positivos a cada uno
x+1 = y
3ª 8x+17 / 7 = x + 1
8x+17 =7x + 7
x = 10