what's x & y in (1, -3) and (3, 5)?

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x is 1, and 3and y is -3, and 5

The intercept is the spot where a series of related points crosses the vertical or horzontal 0-axis.  In other words, the point where either the number you put in (x) or the number you get out (y) is 0.In order to find the intercepts requested above, I think you need to know what sort of function relates them, y=mx+b, ax^2+bx+c=0, y=Kx^p etc.  I'm going to assume for a moment that the coordinates are on a line.(1,-3) and (3,5) are on the line y=4x-7 which crosses the x-axis @ (1.75,0) and the y-axis @ (0,-7)If the equation the turns 1 into -3 and 3 into 5 isn't a line, that will change the intercepts.