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one variable and systems of equations in two variables · 第 31 题

one variable and systems of equations in two variables · 原库模块 1 · Q31 原库参考解析

y =2x2 -21x + 64
y =3x + a 
In the given system of equations, a is a constant. The graphs of the equations in the given system intersect at exactly one point, (x , y ), in the xy-plane. What is the value of x ?
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