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10. if ( mangle4 = 7x - 20 ) and ( mangle8 = 5x + 18 ), find the value …

Question

  1. if ( mangle4 = 7x - 20 ) and ( mangle8 = 5x + 18 ), find the value of ( x ) so that ( pparallel q ).

Explanation:

Step1: Aplicar el teorema de ángulos alternos internos

Si \(p\parallel q\), entonces \(m\angle4 = m\angle8\) (ángulos alternos internos).
$$7x - 20=5x + 18$$

Step2: Resolver la ecuación para \(x\)

Restar \(5x\) de ambos lados:
$$7x-5x - 20=5x-5x + 18$$
$$2x-20 = 18$$
Sumar \(20\) a ambos lados:
$$2x-20 + 20=18 + 20$$
$$2x=38$$
Dividir por \(2\):
$$x=\frac{38}{2}$$

Answer:

\(x = 19\)