Two angles are supplementary if the sum of their measures is 180∘. If the measure of one angle is 4 x degrees, represent the measure of its supplement as an expression of x

X to represent the other number
Supplementary angles= 180°
4x+x=180
5x=180
X=180/5
X= 36
The second number is 36
The first number is 4x
Since we know that x=36°
That means 4(36)=144°
36+144=180°
Im not sure if this is the solution