Book Maths Puzzle Co-ordinate geometry

Will you please graph this linear equation. y = x - 5.

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Book Other Question

I have a 3 variable equation similar to the one answered earlier but I still can't grasp it because variables are missing. Can someone solve it to get me on track?

x + 2y + z =6
x + y =4
3x + y + z =8 Solve for x, [4x/(x^2+x+3)]+[5x/(x^2-5x+3)]=(-3)/2