1.03 Equations arising from substitution

Ohm's law, given by $V=IR$V=IR, is a formula that describes the relationship between the voltage $V$V, current $I$I and resistance $R$R of some circuit components, such as resistors.

The area of triangle is defined by formula $A=\frac{b\times h}{2}$A=b×h2​. Find the height $h$h of a triangle with Base=$5$5 and Area=$30$30.

$P=2\left(a+b\right)$P=2(a+b) is the formula that describes the perimeter of the rectangle. Find $b$b if $a=2$a=2 and $P=22$P=22.