Calculus.
It is generally not possible to solve a single equation in two variables: this is one such.
You cannot solve one linear equation with two unknown variables.
It is not possible to solve one linear equation in two unknown variables.
2+2
To find the correct variables or answer from a series of problems labs.
Calculus.
You need two independent linear equations to solve for two unknown variables.
Use a variable to represent the unknown. 'Translate' the words to math symbols and write an equation to solve. Solve the equation. Check.
It is generally not possible to solve a single equation in two variables: this is one such.
You cannot solve one linear equation with two unknown variables.
It is not possible to solve one linear equation in two unknown variables.
2+2
You cannot solve one linear equation with two variables.
It is not possible to solve a single linear equation in two variables.
This equation is incomplete, and to solve for two variables, you need two equations. So there is no "answer" for this.
By substitution or elimination of one of the variables which usually involves simultaneous or straight line equations.