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An unkown mass M is found to have a period of oscillation of 1 second using a spring of unkown spring constant K. When 200gms were added to the initial mass, the period of oscillation increased by 0.6 seconds. Determin the unkwon mass M(gms) and the Spring Constant K(N/m).

I am not very good at working with problems that have 2 variables. I have come up with a formula however.

T=2pi(sq.rt[M/K])

1 = 2pi(sq.rt[M/K])

1.6 = 2pi(sq.rt[m+.2]/K]

1/1.6 = sq.rt[m/m+.2]

however, i can not for the life of me figure out how to get the answer for M for this.

Is anyone willing to help me?