$The relation between running time (a) and maintenance cost (z) is as given below:$

Running time ( $a$ ) 3 7 11 15

Maintenance cost ( $z$ ) 9 17 25 33

z = 3 a - 2

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z = 2 a - 3

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z = 2 a + 3

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z = 3 a + 2

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Solution

The correct option is C $z = 2 a + 3$
The given table is,

Running time ( $a$ ) 3 7 11 15

Maintenance cost ( $z$ ) 9 17 25 33

It can be observed,
$3 \times 2 + 3 = 9$
$7 \times 2 + 3 = 17$
$11 \times 2 + 3 = 25$
$15 \times 2 + 3 = 33$

Hence,
$z = 2 a + 3$

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Maintainance cost ( $z$ )	9	17	25	33

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