Find an equation that has a answer of (0,5)

Answer 1

y=5, x=0

x+y = 5

x-y = -5

x^2-y^2 = -25

(x-y)(x+y) = -25

(y-x)(x+y) = 25

all have x=0, y=5 as a solution

but if you have one equation 2 unknowns, there are endless other solutions

(y-5)x = 0 has solutions x=0 and y=5, but also other solutions (0,y) and (x,5) where x and y can be any real number or complex number

xy= 5x