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The slope-intercept equation y = mx + b is that they mechanically substitute for m and b without understanding their meaning.
RO- the meaning in Marketing
it denotes the set of ordered pairs with elements of A and b in the format (a,b)
Subtraction means addition of the additive inverse. For two numbers a and b, we say a-b when we mean a + (-b) where -b is a number with the property that b + -b = 0. This applies to all real numbers, which of course includes integers.
If the symbol is like "< " but rounded , then set A < B means every element of set A is found in set B, but there is some element of set B that is not in A. In words it says that A is a proper subset of B.