Make x the subject of the formula: y = 3x - 9c/4x + 5d

Correct Answer is : x = −(9c+5dy)4y−3-(9c + 5dy)/4y - 34y−3−(9c+5dy)

Correct Answer is : x = −(9c+5dy)4y−3-(9c + 5dy)/4y - 34y−3−(9c+5dy)

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JAMB Mathematics 2023 Paper

Question : 8

Total: 80

\frac{3x - 9c}{4x + 5d}

Solution:

y = $\frac{3x - 9c}{4x + 5d}$

$\frac{y}{1} = \frac{3x - 9c}{4x + 5d}$

= y(4x + 5d) = 3x - 9c

= 4xy + 5dy = 3x - 9c

= 4xy - 3x = -9c - 5dy

= (4y - 3)x = -9c - 5dy

= x = $\frac{-9c - 5dy}{4y - 3}$

x = $\frac{-(9c + 5dy)}{4y - 3}$

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