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to subsitute you mean make one side equal to only one placehloder
so -x+y=-5 make equal to y add x to both sides y=x-5
subsitute x-5 for y in second equation 3x-5(x-5)=9 3x-5x+25=9 add like terms -2x+25=9 subtract 25 from both sides -2x=-16 divide by 2 -x=-8 multiply -1 x=8 subsitute 8 for x in first equation
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