QUESTION IMAGE
Question
given ( m parallel n ), find the value of ( x ) and ( y ).
Step1: 利用对顶角或平行线性质
因为\(m\parallel n\),且\((5x - 1)^\circ\)与\((4x + 6)^\circ\)是内错角(或根据对顶角、邻补角等关系,这里观察图形,\((5x - 1)^\circ\)和\((4x + 6)^\circ\)应该是相等的?不对,重新看,\((5x - 1)^\circ\)和\((4x + 6)^\circ\)所在的直线,因为\(m\)是直线,所以\((5x - 1)^\circ\)和\((4x + 6)^\circ\)与\(y^\circ\)的关系,其实\((5x - 1)^\circ\)和\((4x + 6)^\circ\)是同位角?不,应该是\((5x - 1)^\circ\)和\((4x + 6)^\circ\)相等吗?不对,再仔细看,\(m\)是一条直线,所以\((5x - 1)^\circ + y^\circ = 180^\circ\),\((4x + 6)^\circ + y^\circ = 180^\circ\),所以\(5x - 1 = 4x + 6\)?
对,因为同角的补角相等,所以\(5x - 1 = 4x + 6\)。
Step2: 解方程求\(x\)
\(5x - 1 = 4x + 6\),移项得\(5x - 4x = 6 + 1\),即\(x = 7\)。
Step3: 求\(y\)的值
先求\(4x + 6\)的值,把\(x = 7\)代入,\(4\times7 + 6 = 28 + 6 = 34\),因为\((4x + 6)^\circ + y^\circ = 180^\circ\),所以\(y = 180 - 34 = 146\)。或者用\(5x - 1\),\(5\times7 - 1 = 35 - 1 = 34\),同样\(y = 180 - 34 = 146\)。
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\(x = 7\),\(y = 146\)