Question

Find the Value of 4x - 3y
If 3x + 2y = 8 & 2x - y = 3 then find 4x - 3y?

Answer 1

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