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Mathematics 12 Online
OpenStudy (anonymous):

Plz i need help to an exercise : http://www.noelshack.com/2015-14-1428230280-received-863950010332855.jpeg

OpenStudy (texaschic101):

8x - 3y = -6 4x + 5y = 36 -->(-2) ----------------- 8x - 3y = -6 -8x - 10y = - 72 (result of multiplying by -2) ----------------add -13y = -78 y = -78/-13 y = 6 4x + 5y = 36 4x + 5(6) = 36 4x + 30 = 36 4x = 36 - 30 4x = 6 x = 3/2 check.. 8x - 3y = -6 8(3/2) - 3(6) = -6 12 - 18 = -6 -6 = -6 (correct) solution : x = 3/2 and y = 6

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