Question

which equation can be used to solve for x?
9x + 3 = 66
5x + 3 = 66
12x = 66
8x = 66
solve for x.
x =

Explanation:

Step1: Use vertical angles property

Vertical angles are equal. So, \((5x + 3)^{\circ}+(4x)^{\circ}=66^{\circ}\). Combine like terms: \(5x+4x + 3=66\), which simplifies to \(9x+3 = 66\).

Step2: Solve the equation \(9x+3 = 66\)

Subtract 3 from both sides: \(9x+3 - 3=66 - 3\), so \(9x=63\).
Divide both sides by 9: \(x=\frac{63}{9}\).

Answer:

\(x = 7\)