Answer:
(x,y)=(-2,-5)
Step-by-step 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
b
0
2x-x+7 = x+3+4
2x-x-x = -7+3+4
2x-2x = -4+4
0 = 0
0.595
= 595/1000
= 119/200