Show and explain how replacing one equation by the sum of that equation and a multiple of the other produces
a system with the same solutions as the one shown.
8x + 7y = 39
4x- 14y = -68
Just wanna know

How do you use the additive inverse to evaluate an expression that uses subtraction in a full sentence

The inside wheels of a car traveling on a circular path are rotating half as fast as the outside wheels. the front two wheels are six feet apart. what is the number of feet in the path traced by the inside front wheel in one trip around the circle? express your answer in the form "k \pi", where k is an integer.

Multiply and simplify 2x^2 y^3 z^2 · 4xy^4 x^2