Book Maths Puzzle Co-ordinate geometry

Graph the linear inequality:
x + y > 5.
Find the slope of the line, the x-intercept, the y -intercept and the side of the half-plane answer with respect to the origin.

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Book Other Question

I have 6 systems questions which i dont understand at all. help.how do you solve these?

1.x+y=4
y=2x+1

2.x+y=10
y=x+8

3.x=y-1
y=4-2x Determine which of the ordered pairs following each inequality satisfy that inequality.
3x - 5y > - 12: (2, -3), (2, 8), (0, 0)