Question

How many solutions does the following system of equations have?
x=-1
x^2+y^2=4

Answer 1

x^2+y^2=4

(-1)^2+y^2=4 ... plug in x = -1

1 + y^2 = 4

y^2 = 4-1

y^2 = 3

I'll let you finish

Answer 2

Would it be just one solution then?

Answer 3

no because y^2 = 3 has two solutions (you're forgetting about the plus/minus)

Answer 4

Oh shoot, thank you!

Answer 5

its ok, silly mistake

Answer 6

yw