Answer: 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.
