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Functions, 2ADV EQ-Bank 24

Solve the following simultaneous equations

\(6 x-7 y=-6\)

\(4 x+2 y=16\)   (2 marks)

--- 9 WORK AREA LINES (style=lined) ---

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\(x=\dfrac{5}{2}, \ y=3\)

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\(6x-7y=-6\ \ldots\ (1)\)

\(4x+2y=16\ \ldots\ (2)\)
 

\(\text{Mult \((1) \times 2\ \) and \(\ (2) \times 3\):}\)

\(12 x-14 y=-12\ \ldots\ \left(1^{\prime}\right)\)

\(12 x+6 y=48\ \ldots\ \left(2^{\prime}\right)\)
 

\(\text{Subtract}\ \ \left(2^{\prime}\right)-\left(1^{\prime}\right):\)

\(20 y=60 \ \Rightarrow \ y=3\)
 

\(\text{Substitute} \ \ y=3 \ \ \text{into (2):}\)

\(4 x+6=16 \ \Rightarrow \ x=\dfrac{5}{2}\)

Filed Under: Linear Functions Tagged With: Band 4, smc-6214-50-Simultaneous Equations

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