substitution method, Algebra

solve x-y=8 and x+y=4 using one of the algebraic methods
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General problems for homework

Give all solutions of the nonlinear system of equations including those with nonreal complex compents: xy=-20 3x+5y=5

one no. is 7 more than another and its square is 77 more than the square of the smaller number.What are the numbers?

Actually here we're not going to look at a general cubic polynomial.  Here we are jsut going to look at f ( x ) = x 3 . Really there isn't much to do here other than only plugging

would a slope of a quadratic function get narrower or wider if the slope is changed from 3 to 2.5?