if indeed r || s, that will only occur if those two corresponding angles of 1 and 2 are equal to each other, namely ∡1 = ∡2, or 60 - 2x = 70 - 4x.
[tex] \bf 60-2x=70-4x\implies 2x=10\implies x=\cfrac{10}{2}\implies x=5 [/tex]
