SOLUTION: solve this system of equations algebraically : x^2+y^2=25, 4y=3x

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Question 284049: solve this system of equations algebraically :
x^2+y^2=25, 4y=3x
Answer by hello_me(3) About Me  (Show Source):
You can put this solution on YOUR website!
ok so we have our two equations. so why not sub in y? so we have 4y=3x
so y=3x/4
when we sub that in we get x^2+9x^2/16 =25
now to get rid of our fraction mulitply ecverything by 16
and we get
16x^2+9x^2 = 400
we then get 25x^2 = 400
so x^2 = 16
there fore x can equal 4 or -4