2x - 5y = - 70 and - 5 x + 10 Y = 100 by elimination method
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2x-5y=-70
x=-70\2 - 5y\2
x=-35 - 5y\2 -------(1)
-5x+10y=100 ------(2)
put equation (1) in equation (1)
-5(-35-5y\2)+10y=100
175+25y\2+10y=100
45y\2=100-175
45y\2=-75
45y=-150
y=-10\3 put in equation (1)
x=-35-25\3
x=-135\3
x=-45
x=-45, y=-10\3
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