# Which system of equations is not a linear system?a) 2x + y = 11x = 13 + yb) 2x = 11 - y4x - y = 13c) -1/2 x - y = 3/43/2 x + 2 = -7/8d) -x² + y = 10x + y = 5

Which system of equations is not a linear system?
a) $2x+y=11$
$x=13+y$
b) $2x=11-y$
$4x-y=13$
c) $-\frac{1}{2}x-y=\frac{3}{4}$
$\frac{3}{2}x+2=-\frac{7}{8}$
d) $-x²+y=10$
$x+y=5$

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yunitsiL

A system of linear equations has equations that can be written in the form $Ax+By=C$. Since choice d has an equation where x is squared, then it is not a system of linear equation.
So, the correct answer is choice d.