Someone please explain This is the third time i post this question

Use Cramer's rule to find the solution to the following system of linear equations.
x-2y = -7
5x-9y=-5

Suppose that f(0) = −3 and f '(x) ≤ 8 for all values of x. how large can f(4) possibly be? solution we are given that f is differentiable (and therefore continuous) everywhere. in particular, we can apply the mean value theorem on the interval [0, 4] . there exists a number c such that

How much orange juice do you need to make 2 servings of lemony orange slush?

Use the elimination method to solve the systems of equations.choose the correct ordered pair. 7x+4y=39