Solving simple math problems with elimination and subsitution

Posted on 2013-11-29 11:34:00 in Math by JOE D

Hey guys I have a few online homework problems I cannot figure out because I havent taken a math class in a few years! please help!



SOLVE THE SYSTEM



1)

x^2+y^2 = 16

x+y = 1

2)

y+x^2 = 4x

y +4x = 16

3)

x^2 + 8x + y^2=209

4 x + 3 y = -91

4)

x+y^2=0

2x+5y^2=3

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