Question

×=-y+1/2y=×-4 by elimination method

Answer 1

x=-y+1/2----(1)
y=x-4
x=y+4---(2)
add (1) and (2)
2x=1/2+4
2x=9/2
x=9/4
put x=9/4 in (2)
9/4=y+4
9/4-4=y
(9-16)/4=y
-7/4=y
therefore
x=9/4 and y=-7/4

Answer 2

x=-y+1/2----(1)
y=x-4
x=y+4---(2)
add (1) and (2)
2x=1/2+4
2x=9/2
x=9/4
put x=9/4 in (2)
9/4=y+4
9/4-4=y
(9-16)/4=y
-7/4=y
therefore
x=9/4 and y=-7/4

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