Question

у = $-frac{3}{8}$ х +7,5
Найдите х ,если у=1, у=-1, у= $-frac{2}{3}$ , у=5

Answer 1

$y=-frac{3}{8}x+7,5;\frac{3}{8}x=7,5-y;\x=20-frac{8}{3}y;\y=1; x=20-frac{8}{3}=17frac{1}{3};\y=-1; x=20+frac{8}{3}=22frac{2}{3};\y=-frac{2}{3}; x=20-frac{8}{3}(-frac{2}{3})=18frac{2}{9};\y=5; x=20-frac{8}{3}*5=6frac{2}{3};$