$\"\"$

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Observe the graph:

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The system of equations are $\"\"$ and $\"\"$ .

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Consider the scale on the graph about $\"\"$ and $\"\"$ axis is each one $\"\"$ .

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Hence, the lines intersects on the grpah at the point is $\"\"$ .

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Chek the solution for $\"\"$ values.

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Case (i):

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$\"\"$ (First equation)

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Multiply)

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$\"\"$ (Subtract: $\"\"$ )

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Case (ii):

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$\"\"$ (Second equation)

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Multiply)

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$\"\"$ (Add: $\"\"$ )

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The solution set is $\"\"$ .

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$\"\"$

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The solution set is $\"\"$ .