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Mathematics 9 Online
OpenStudy (anonymous):

Using the figure below, what is the value of y? http://roads.advancedacademics.com/contentserver/content/roadssection/279369/questions/assessments/i-parallelperpendicularlinesquiz/geom_1_4_quiz_4q.gif

ganeshie8 (ganeshie8):

2x + 10 = 4x - 4 (vertically opposite angles) => x = 7 degrees and, x + y =180 (straight line) => y = 173

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