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Elimination or Substitution and how do I do it?
Asked Jan 22, 2008, 05:10 PM
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1 Answer ^=exponent Y^2=25 X^2-2x=4x+16  |
1 Answer
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| Neither! You have 2 unrelated equations. From y^2 = 25 you get values of y (Hint: if x^2 = 49, x = 7 or -7) X^2-2x=4x+16 Becomes x^2 -6x -16 = 0 Which is a quadratic equations, which in this case can be solved by factorising, or By the formula for quadratic equations. Hint for factorising: Find 2 numbers (a and b) whose product is -16 and whose sum is -6. Then factorising gives you (x -a) (x-b) = 0 From which you get 2 values of x: a and b. | ||||
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