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Package A contains 3 birthday cards and 2 thank you notes and cost 18$. package B contains 8 birthday cards and 6 thank you notes that cost 50$ if x represent the cost of birthday card and y represent the cost of a thank you note how much does each birthday card cost?

Respuesta :

3x+2y=18............(equation i)
8x+6y=50............(equation ii)
8x+6y=50.............×1  ⇒8x+6y=50 3x+2y=18.............×3  ⇒9x+6y=54
(8x+6y=50) - (9x+6y=54) = ?
(-x)= (-4)
x = 4

Birthday card @ 4$

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