Answer
I) $b=2a-5$
Work Step by Step
To solve an expression for a given variable, isolate that variable on one side of the expression.
$10a-5b=25$
Use the addition property of equality to subtract 10a from each side.
$10a-5b-10a=25-10a$
Combine like terms.
$-5b=25-10a$
Use the multiplication property of equality to divide both sides by -5.
$-5b\div-5=(25-10a)\div-5$
Divide. Use the distributive property to divide the right side.
$b=-5+2a$
Restate using the commutative property.
$b=2a-5$
