SOLUTION: X = 2y+5 Y = (2x-3) (x+9) How many orderedpairs of( x, y) Satisfy the system of equation above

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Question 1058896: X = 2y+5
Y = (2x-3) (x+9)
How many orderedpairs of( x, y) Satisfy the system of equation above
Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
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X = 2y+5
Y = (2x-3) (x+9)
How many ordered pairs of( x, y) Satisfy the system of equation above
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Substitute the expression for x = 2y+5 of the first equation into the second equation instead of "y". You will get

y = (2*(2y-5)-3)*((2y+5)+9).

Next simplify and solve this quadratic equation.
It is a standard procedure.