y=-2.5 is parallel to the x axis. The equation of the x axis is y=0
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If you mean: y=-5x+10 and the point (3, 10) then the parallel equation is y=-5x+25
25
Center of circle: (2, 5) Point of contact with the x axis: (2, 0) Distance from (2, 5) to (2, 0) equals 5 which is the radius of the circle Equation of the circle: (x-2)^2 +(y-5)^2 = 25
25 cm equals about 10 inches
250