All that you know is that it goes through that one point.
^And if you have the equation of the line in slope-intercept form (y = mx + b) the "b" is the y-intercept. For example, if a y-intercept was at (0, -8), then the equation would be y = mx - 8, but you'd need more information to determine "m."
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If you mean 2x+5y = -10 then the y intercept is -2
The answer is 4
-4.6
Assuming that you meant "x - 4y = 20", the x-intercept is x=20, and the y-intercept is y=-5.
15