by isabela del castillo
(houston tx )
y=2xx+y=21Replace y = 2x into the second equation.we get:x + 2x = 21we get 3x = 21divide both sides of the equation by 33x/3 = 21/3x = 7replace x in either y = 2x or x + y = 21y = 2 times 7y = 14
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