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Find X so that m is parallel to n. Identify the postulate or theorem you used. Please help with these 3 problems, I don’t understand it at all

Find X so that m is parallel to n. Identify the postulate or theorem you used. Please-example-1
User SaadAAkash
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1 Answer

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the corresponding angles should be equal

so,
5x+15=90 \implies 5x=75\implies x=15^(\circ)