Question

1. $u = ka$, for $a$
2. $u = x - k$, for $x$
3. $u = x + k$, for $x$
4. $g = \frac{c}{a}$, for $a$

solve each equation.

1. $|2v - 4| = 10$
2. $|2x + 8| = 10$
3. $|x + 1| = 2$
4. $|-2b + 2| = 10$

Explanation:

Problem 9: \( u = ka \), for \( a \)

Step1: 两边除以\( k \)（\( k

eq0 \)）
\( \frac{u}{k} = \frac{ka}{k} \)

Step2: 化简得

\( a = \frac{u}{k} \)（\( k
eq0 \)）

Step1: 两边加\( k \)

\( u + k = x - k + k \)

Step2: 化简得

\( x = u + k \)

Step1: 两边减\( k \)

\( u - k = x + k - k \)

Step2: 化简得

\( x = u - k \)

Answer:

\( a = \frac{u}{k} \)（\( k
eq0 \)）

Problem 10: \( u = x - k \), for \( x \)