4 Which is the equation of a line parallel to a line with slope -3 and also
passes through (-6, 7).*
O y-7 = 1/3(x + 6)
Oy -7 = -3(x+6)
O y+7= 1/3(x-6)
Oy+7=-3(x - 6)

answer: domain and range mean all possible values of x and y that could be substituted to the inequality. a solution means all possible values that make the inequality statement true. so while the range is still all real numbers, the solution is the shaded area, for which y will always be greater than the line of the function.

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this