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No, if there is a sqaured variable, the equation is not linear.
It seems part of this question is missing. Perhaps the answer is that you might compare the effect to basic functions such as linear, quadratic, or exponential.
"Bilinear" is a mathematical term for something being linear in each variable.
The answer depends on what you mean by "A".
A linear graph shows a linear equation in which the value of one variable depends on the value of the other variable.