Answer:
(x,y)=(-2,-5)
Explanation:
y=1/2x-4
y=-2x-9
(y=) 1/2x-4=-2x-9
1/2x +2x=-9+4
1/2x +4/2x=-5
5/2x=-5
5x=-5*2
5x=-10
x=-2
y=-2x-9=-2*(-2)-9=4-9=-5
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