Question

maths help me out question no 4,3,2

Answer 1

(4):

$\frac{3y + 4}{2 - 6y} = \frac{ - 2}{5} \\ \\ 5(3y + 4) = - 2(2 - 6y) \\ \\ 15y + 20 = - 4 + 12y \\ \\ 15y - 12y = - 4 - 20 \\ \\ 3y = - 24 \\ \\ y = \frac{ - 24}{3} \\ \\ = - 8$

××××××××××××××××

(3):

$\frac{z}{z + 15} = \frac{4}{9} \\ \\ 9(z) = 4(z + 15) \\ \\ 9z = 4z + 60 \\ \\ 9z - 4z = 60 \\ \\ 5z = 60 \\ \\ z = \frac{60}{5} \\ \\ z = 12$

×××××××××××××××

(2):
$\frac{9x}{7 - 6x} = 15 \\ \\ \frac{9x}{7 - 6x} = \frac{15}{1} \\ \\ 9x(1) = 15(7 - 6x) \\ \\ 9x = 105 - 90x \\ \\ 9x + 90x = 105 \\ \\ 99x = 105 \\ \\ x = \frac{105}{99}$

I hope this will help you

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