Question 515343
Yes, you did it correctly.

Given y = 10, the value of x makes no difference to function's value.
x=-infinity, y=10
x=0, y=10, so the y-intercept is (0,10).
x=+infinity, y=10
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There is no change in 'y', while 'x' can vary.  
That means the slope = 0 because y-y<sub>1</sub> = 0 regardless of the value of x-x<sub>1</sub>.
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On a graph you would have:
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{{{ graph(500,500,-20,20,-20,20,10) }}}
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As you may see, the line is parallel to the x-axis, so there is no x-intercept from -infinity to +infinity.
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Done.