A. given the following system of equations, use cramer's rule to find the value of x -x + 7y-2x=1 b. find a basis for the given subspace of r' and state its dimension: 1. all vectors of the form (a, b, a -b, a+ b). 2. all vectors of the form (a, a, a, a). 3. all vectors of the form (a, b, c, 0).

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step-by-step explanation:

answer: b.

step-by-step explanation:

the y coordinate for point b is 0, and answer b is the only one with that y coordinate.

step-by-step explanation:

to find if any function is an inverse of the other, put the first equation in as x in the next one. then simplify and solve. if at the end you get the statement y = x, then it is an inverse. if you get anything else, it is not.