Why x - 10 = y + 10 and x+20 = 2 (y - 20
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x - 10 = y + 10 x+20 = 2 (y - 20)
x-y=10+10 x+20=2y-40
x-y=20 equation-1
x-2y=-60 equation-2
BY USING THE SUBSTITUTION METHOD
(x-y=20 ) MLTIPLY IT BY -1
x-2y=-60
-X+Y=-20
x-2y=-60
---------
0-Y=-80
Y=80
PUT THE VALUE OF 'Y' IN EQUATION---1
x-y=20
X-80=20
X=20+80
X=100
X=100 Y=80
BECAUSE,
x - 10 = y + 10 and x+20 = 2 (y - 20)
100-10=80+10 100+20=2 (80-20)
90=90 120=2 (60)
----- 120=120
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