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Rate of change:

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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The slope m of a non vertical line through any two points is given by,

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$\"\"$

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Substitute $\"\"$ in rate of change

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formula.

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$\"\"$

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$\"\"$

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$\"\"$ (Product of two same signs is positive) \ \

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$\"\"$ (Subtract: 4y – y = 3y)

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$\"\"$ (Add: 2 + 4 = 6) \ \

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$\"\"$

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$\"\"$ (Multiply each side by 6)

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$\"\"$ (Cancel common terms)

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$\"\"$ (Multiply: $\"\"$ ) \ \

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$\"\"$ (Divide each side by -2)

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$\"\"$ (Cancel common terms)

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$\"\"$ (Divide: $\"\"$ )

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$\"\"$

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The value of $\"\"$ .