Question

MÉTODO DE reduccion −10x−5y=0 21x−7y=28

Answer 1

-10x -5y= 0 (-7) = 70x +30y = 0
21x -7y= 28 (5) = 105x -30y = 140

se hace la suma o resta

175x= 140
x=140/175
x= 4/5

entonces
-10(4/5) - 5y = 0
-8 -5y= 0
y=8/5