Yes it is. First of all, you have variables and an equal sign(hence the term "equation"). The equation can be dissected with simple common sense. X and Y must be the same number, but with opposing signs( + OR - ). If looking for a broader answer, a second equation is required because two equations solve two unknowns.
The coordinates of the x intercept for the equation y equals x plus 1 is (x=-1, y=0).
x=0
2
x = 0 or x =-5
It is a quadratic equation in the variable x.
x = 0 and y = 4
The coordinates of the x intercept for the equation y equals x plus 1 is (x=-1, y=0).
It is a linear equation in x. The equation has the solution x = 0.
x=0
The discriminant is 0.
2
x = 0 or x =-5
No, It's a a quadratic equation because you have X squared.
It is a quadratic equation in the variable x.
(5, 0)
X=-3
True because in both equations x = 0 or x = -4