m3: -7x+y=-19
-2x+3y=-19
-21x+3y=-57
-2x+3y=-19
subtracting the equations...
-2x+21x+3y-3y=-19+57
19x=38
x=2
which leads us to y=5
:)
-2x+3y=-19
-21x+3y=-57
-2x+3y=-19
subtracting the equations...
-2x+21x+3y-3y=-19+57
19x=38
x=2
which leads us to y=5
:)
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