In general the straight line equation is: y = mx+b whereas m is the slope and b is the y intercept
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If the equation is: y = -x then the slope is -1 and there is no y intercept
y = x - 7 or, y = 1*x - 7 so that the slope is 1.
If you mean: y = 3.8x then the slope is 3.8 with no y intercept
Answer 1As for example in the straight line equation of: y = 3x+5 the slope is 3 and the y intercept is 5Answer 2The slope could obtained either by giving two (x,y) points on the line or to give the line (x,y) equation.
If you mean -x+y = 12 then y = x+12 and so the parallel line will have the same slope but with a different y intercept.