solve the equations simultaneously
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Step-by-step explanation:
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Step-by-step explanation:
(a) y=(2÷3)x+6 and 2y-4x=20 3y-2x=18 and 2y -4x=20 subtracting both the equations 3y-2x-18-(2y-4x-20) =0
then 3y-2x-18-2y+4x+20=0
y+2x+2=0
(b) -7x+4y=41 and -5x+6y=45
-7x+4y-41=0 and -5x+6y-45=0
subtract 2nd equation in 1st equation
-7x+4y-41-(-5x+6y-45) =0
-7x+4y-41+5x-6y+45=0
-2x-2y+4=0
-x-y+2=0
taking '-' common
then x+y-2=0
(c) 7x+4y=54 and 2x+3y=21
7x+4y-54=0 and 2x+3y-21=0
subtract 2nd equation in 1st equation
7x+4y-54-(2x+3y-21) =0
7x+4y-54-2x-3y+21=0
5x+y-33=0
(d)3x+7y=27 and 5x+6y=39
3x+7y-27=0 and 5x+6y-39=0
subtract 2nd equation from 1st e
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