For the inverse variation equation xy = k, what is the constant of variation, k, when x = 7 and y = 3?

Choose the correct classification of 3x4 − 9x3 − 3x2 + 6. 5th degree polynomial 4th degree polynomial 9th degree polynomial 24th degree polynomial

Answer this question! 30 points and brainliest! only if you know the answer.

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.