Question

respondam às perguntas da foto abaixo observação Vale 45 pontos

Answer 1

$a)~(-19).y=-133\to\\\\ -19y=-133(-10\to\\\\ 19y=133\to\\\\ y= \frac{133}{19} \to \\\\y=7$




$b)~y-19=-133\to\\\\ y=-133+19\to\\\\ y=-114$




$c)~8y-29=23\to \\\\ 8y=23+29\to \\\\ 8y=52\to \\\\ y= \frac{52}{8} \to \\\\ y= \frac{13}{2}~ou~x=6,5$




$d)~5y-9=-23\to \\\\ 5y=-23+9\to \\\\ 5y=-14\to \\\\ y=- \frac{14}{5}~ou~x=-2,8$




$e)~ \frac{7x}{2} =21\to \\\\ 7x=42\to \\\\ x= \frac{42}{7} \to \\\\ x=6$




$f)~ \frac{3x-15}{3} =5\to \\\\ 3x-15=15\to \\\\ 3x=15+15\to \\\\ 3x=30\to \\\\ x= \frac{30}{3} \to \\\\ x=10$