[tex]\displaystyle\bf\\y=2x-7\\\\1)\\\\x=1\\\\y=2\cdot 1-7=2-7=-5\\\\\boxed{y=-5}\\\\2)\\\\x=5\\\\y=2\cdot 5-7=10-7=3\\\\\boxed{y=3}\\\\3)\\\\x=-1\\\\y=2\cdot(-1)-7=-2-7=-9\\\\\boxed{y=-9}[/tex]
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[tex]\displaystyle\bf\\y=2x-7\\\\1)\\\\x=1\\\\y=2\cdot 1-7=2-7=-5\\\\\boxed{y=-5}\\\\2)\\\\x=5\\\\y=2\cdot 5-7=10-7=3\\\\\boxed{y=3}\\\\3)\\\\x=-1\\\\y=2\cdot(-1)-7=-2-7=-9\\\\\boxed{y=-9}[/tex]