Choose the equations that are not linear equations.
- x - y = 2
x2 + y = 4
- y - 1
x=5
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x^2+y=4 and -y-1 are not linear equations.

Step-by-step explanation:

The exponent in x^2 indicates this is a polynomial equatuon, because when graphed, it doesn't form a line.

In -y-1, there is no given x value. y is an output of a solved x equation, so without an x, it cannot be completed. Equations depend on a number that can be plugged in. When graphed, it appears as an error.

-x-y=2 is linear because it can be rearranged to solve for y and can be graphed as linear.

x=5 is linear because it gives an input value, and shows that the output value when solved is 0 (no y means it will always be 0). When graphed, it shows a straight line, which is linear.

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.