Alright, buckle up buttercup. When you subtract a negative, it's like adding a positive. So, -15 minus -10 is the same as -15 plus 10, which equals -5. There you have it, simple math for your beautiful brain.
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-6 -15 = -21
-12-(+10)=-22. Negative 22 is the final answer
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7y+3=y+18 Subtract three 7y=y+15 Subtract y 6y=15 Divide Y=15/6 That's your fraction if you need a decimal just type it in the calculator...
Points: (6, -10) and (-15, 15) Slope: (-10-15)/(6--15) = -25/21