Find the Value of 4x - 3y
If 3x + 2y = 8 & 2x - y = 3 then find 4x - 3y?
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3x+2y=8----------(1)
2x-y=3-----------(2)
multiply (2) with 2 and subtract from (1)
3x + 2y = 8
4x - 2y =6
__________
7x = 14
therefore x= 14/7
x= 2
sustitute x=2 in (1)
3(2) +2y =8
6+2y =8
2y = 8-6
2y=2
y=2/2
y=1
therefore x=2 and y=1
4x-3y = 4(2)-3(1)
=8-3
=5
2x-y=3-----------(2)
multiply (2) with 2 and subtract from (1)
3x + 2y = 8
4x - 2y =6
__________
7x = 14
therefore x= 14/7
x= 2
sustitute x=2 in (1)
3(2) +2y =8
6+2y =8
2y = 8-6
2y=2
y=2/2
y=1
therefore x=2 and y=1
4x-3y = 4(2)-3(1)
=8-3
=5
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