If you don't learn to solve equations then guess and check is the only way to arrive at new information.
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You need as many equations as you have variables.
Derivative calculators are commonly used to help solve simple differential calculus equations. Generally, they are not able to solve complex calculus equations.
You plug in what the variable is equal to for that variable then you will be able to finish the problem
The answer is that it cannot be done. To solve a set of equations in k variables (in this case, 2) you need at least two independent equations.
Tell me the equations first.