Oh, dude, you're hitting me with some math right off the bat, huh? Okay, let's break it down. If you start with a number and then subtract 3 from it, and you end up with 4, well, that number must have been 7. So, 7 minus 3 equals 4. Easy peasy lemon squeezy.
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(-3) - (-7) = (-3) + (+7) = (-3) + 7 = 4
x=-1 ^ how do you know?
If you mean subtracting a negative number from another negative, then you simply add the second negative to the first number. For example: -3 - (-4)=1 -3 + 4 = 1 The double negative makes the equation an addition.
y=-4x + 3 or generally y=mx + b so m, or gradient = -4
-7 minus -4 is -3