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Lf 5x-3y=9 and 3x-5y=7 then find (x-y) |
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Answer» Answer: 3x+5y=7 Therefore: 3x+5y+2=9 Because both EQUATIONS now equal 9, we can SET them equal to each other. 5x+3y=3x+5y+2 simplify to get 2x-2y=2 2x=2y+2 X=y+1 Now substitute y+1 for x in one of the original equations. 5(y+1)+3y=9 5y+5+3y=9 8y+5=9 8y=4 y=0.5 Now plug 0.5 in for y and solve for x 3x+5(0.5)=7 3x+2.5=7 3x=4.5 x=1.5 Now SIMPLY ADD x and y together to get your answer. 1.5+0.5= 2 x+y= 2 |
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