[tex]\displaystyle\bf\\y=-2x+5\\\\1) \ \ x=4\\\\y=-2\cdot 4+5=-8+5=-3\\\\\boxed{y=-3}\\\\\\2) \ \ y=17\\\\17=-2x+5\\\\2x=5-17\\\\2x=-12\\\\\boxed{x=-6}[/tex]
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[tex]\displaystyle\bf\\y=-2x+5\\\\1) \ \ x=4\\\\y=-2\cdot 4+5=-8+5=-3\\\\\boxed{y=-3}\\\\\\2) \ \ y=17\\\\17=-2x+5\\\\2x=5-17\\\\2x=-12\\\\\boxed{x=-6}[/tex]