Question

4x-5y=4 and 2x-y=8,using this information,determine the value of x-y.

Answer 1

add the two equations and divide by 6.

Answer 2

4x-5y=4.....(1)
2x-y=8......(2)

(2)x2 4x-2y=16...(2')
(2')-(1) 3y=12
y=4
sub ke (2)
2x-4=8
2x=12
x=6

x=6,y=4

Answer 3

4x - 5y = 4
+2x - y = 8
------------
6x - 6y = 12

Dividing by 6 gives:

\[\frac{6x-6y}{6} = \frac{12}{6} \iff x - y = 2\]

Answer 4

thanks