Book Maths Puzzle Algebra

How would I go about solving the system of equations using all three methods, graphing, substitution, addition for:

y=-x+7
y= 1/2x -5

I have worked on this for two days, and

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Book Other Question

How do I write an equation for a parabola that crosses the x axis at (1.5, 0) and (4.5,0)? Chris has determined that the flight of a golf ball hit with a 9-iron can be defined by h= -0.012t^2 + 1.2t, where t is time in seconds and h is height in meters of the ball. Chris