three equations hold simultaneously for x and y, find the value of p.
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multiply (3x +7y)=-5 by 4
&
4x-3y =8 by 3
now equate both you will get
12x+28y=-20 &
12x -9y =8
now subtract both you will get
37y=48
therefore y=48/37
now put y in any one of the equations and you will get
x=38/37
now px+y=1
so,px=1-y
px=85/37
so, p*38/37=85/37
so, p=45/38
&
4x-3y =8 by 3
now equate both you will get
12x+28y=-20 &
12x -9y =8
now subtract both you will get
37y=48
therefore y=48/37
now put y in any one of the equations and you will get
x=38/37
now px+y=1
so,px=1-y
px=85/37
so, p*38/37=85/37
so, p=45/38
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