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The 67th face of the eighth grade in the whole math exercise book chooses to do the problem.
If the image of the proportional function y=kx(k is not equal to 0) passes through this point (-1, 2), the analytic expression of the proportional function is y=?

Solution: Substitute the point (-1, 2) into y=kx, get 2=-k, get k=-2, then the analytic formula of the proportional function is y=-2x.