If x=5 and y=2 workout the value of

Mathematics

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Komok [63]2 years ago

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Solve this problem pls don't spam

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10-1/4+25-3/4+16-1/2
10.25+25.75+16.5
36+16.5
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1 year ago

9x-2y=-21 2x+3y=16 Substitution

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$9x-2y=-21 \\\\ 9x=-21+2y \\\\ => \boxed{x=\frac{2y-21}{9}} \\\\ 2x+3y=16 \\\\ 2*\frac{2y-21}{9}+3y^{(9}=16^{(9} \\\\ 2(2y-21)+27y=144 \\\\ 4y-42+27y=144 \\\\ 31y=144+42 \\\\ 31y=186 \\\\ \boxed{y=\frac{186}{31}=6} \\\\ x=\frac{2*6-21}{9} \\\\ x=\frac{12-21}{9} \\\\ x=\frac{-9}{9} \\\\ \boxed{x=-1}$