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The value of x that solves the equation -243 = 90 - 9x is x = -12.
3x-1=11 solves to x=4. Plug in 4 to get 42+4. The answer is 20.
89
If two variable, X and Y are in direct variation, then the proportion of X/Y or Y/X has a constant value.
An inverse proportion between two variables is when the value of one variable increases, the other decreases. Mathematically, this is shown as: x = k / yn where x and y are the two variables, and k and n are constants.