x = 5 - 4y
Explanations:The given equation is:
5x + 20y = 25
To make x the subject of the formula, take 20y to the other side of the equality sign:
20y becomes -20y on the other side
The equation becomes:
5x = 25 - 20y
Divide both sides by 5
[tex]\begin{gathered} \frac{5x}{5}=\frac{25-20y}{5} \\ x\text{ = }\frac{25-20y}{5} \\ x\text{ = }\frac{5(5-4y)}{5} \\ x\text{ = }5\text{ - 4y} \end{gathered}[/tex]
