Question 331506
a) 6x-y=-5
b) x^2+y^2=123+10y

a) y=6x+5
b) x^2+(y-5)^2-25=123 => x^2+(6x)^2=148=37*x^2

=> x^2=4 

=>  x=+2, -2 
and y=17, -7 (with a)