5x-4x=1 x4 -4x-3(1)=-7
-4x-3=-7
2. -20x-15y=-35 -4x=-7+3
20x-16y=4___ x=-4/-4
-31y=-31 x =1
Y=-31/31
Y=1
en el paso dos el -20 y el 20 se simplifican
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5x-4x=1 x4 -4x-3(1)=-7
-4x-3=-7
2. -20x-15y=-35 -4x=-7+3
20x-16y=4___ x=-4/-4
-31y=-31 x =1
Y=-31/31
Y=1
en el paso dos el -20 y el 20 se simplifican