Question 447031
Since y = 3x, we can use a substitution in the first equation.

x^2 +{3x)^2  = 10

10x^2   = 10
x^2 = 1
x = 1

Substituting into the first equation, we get

1 + y^2  = 10
y^2  = 9
y = 3.

This checks with the second equation, 3 = (3)(1).


Cleomenius.