you cant
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Elimination and substitution are two methods.
plug in a 0 for the "x" value of the equation, and solve it :D
You cannot solve one linear equation in two unknown variables.
a is the coefficient of the x2 term. If is a = 0, then it is no longer a quadratic - it is just a linear equation, and the quadratic formula will not work to solve it.
you put in what x is and solve it for y! thats the answer!