Question

how do I solve for a for the indicated variable​

Answer 1

Answer:

16)

$a=-\dfrac{3}{4u}$           .......as required

18)

$a=\dfrac{u}{4}$..........as required

Step-by-step explanation:

16)

$u=-\dfrac{3}{4a} ,for\ a$

Multiply both the side by 'a'  and divide both the side by 'u'

$\dfrac{a}{u}\times u=-\dfrac{3}{4a}\times \dfrac{a}{u}$

Cancel 'u'on Left side and 'a' on right side we get

$a=-\dfrac{3}{4u}$           .......as required

18)

$u=4a$.......Given

Dividing by 4 on both the side we get

$\dfrac{u}{4} =\dfrac{4a}{4}$

Cancel 4 on right side we get

$a=\dfrac{u}{4}$..........as required