Explanation:
-4m -5n = 1 ------------------(1)
-6m +12n = -18--------------(2)
multiplying eq (1) by 3 and (2) by 2
therefore, the new eq obtained is
-12m -15n = 3 --------------(3) subtracting (3) AND
-12m +24n = -36-----------(4) (4)
(+) (-) (+)
--------------------------
-39n = 39
n= -1 ------------(5)
subtituting (5) in (1)
therefore,
-4m -5×-1 =1
-4m +5=1
-4m=1-5
-4m=-4
m= 1
hence calue of m is 1 and n is -1