Sandra Edwards asked 7/6/2011 How to solve the following linear equations by substitution method: 1) x^2+y^2=13 and 2x-y=4 2) 4x^2+9y^2=72 and 2x-y=4 3)4x^2+9y^2=72 and x-y^2=-1?
Sandra Edwards asked 7/5/2011 Please help me solve this problem: The hyperbola with center at (4,5) with vertices at (0,5) and (8,5) with b=2?
