It is difficult to be sure because the browser used for posting questions is lousy: it strips out most mathematical symbols. Assuming that the x and y terms are both negative, the answer is -0.4
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If you mean -2x-5y = 10 then y = -0.4x-2 whereas -0.4 or -2/5 is the slope and -2 is the y intercept
2x+y = 10 or y = -2x + 10 so the slope is -2
2x-5y = -10 -5y = -2x-10 y = 2/5x+2 which is in slope intercept form
12
-5y +2x = -10 -5y = -2x -10 y = 2/5x +2 So the slope = 2/5 and the y intercept = 2
y = -2x+10