What is the least common multiple of 42 and 21

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Simplify the expression and find the missing terms. the simplest form of has in the numerator and in the denominator.

Select 2 statements that are true about the equation y+6=-10(x-3).1) the slope of the line is -102) the slope of the line is 33) one point on the line is (3,6)4) one point on the line is (3,-6)