|
Answer» Hye
===========================================================
1)49x-57y=172 and 57x+49y=252
=> 49x-57y=172...........[1]
57x+49y=252 ..................[2]
when we add [1] and [2]
we get
=>106x - 106y = 424
now let us divide all 3 numbers by 106
=> x - y = 4 .................[3]
now on subtracting [1] and [2]
we get
=> -8x - 8y = -80
now let us divide 8 to all 3 no.
=> x + y = 10 ...............[4]
----------------------
now, SINCE
x - y = 4
x +y = 10
let us add them both
=>2x = 14
=>x = 14/2
=>x = 7
since x - y = 4
=>7 - y = 4
=> y = 7-4
=>y = 3
so x = 7 & y = 3
==========================================================
hope it helps u..................
|
