Question

2r - 3.1 =1.7 ; 4t + 3.5 =12.5 ; 8m - 5.5 =10.1 i really need help plzzzzzzz

Answer 1

$2r - 3,1 = 1,7$
Keep the numbers with incognito on the left and the numbers without incognito on the right. Exchanging the signs when changing sides if applicable.
$2r = 1,7 + 3,1$
$2r = 4,8$
$r = \frac{4,8}{2}$
$\boxed{r = 2,4}$


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$4t + 3,5 = 12,5$
Keep the numbers with incognito on the left and the numbers without incognito on the right. Exchanging the signs when changing sides if applicable.
$4t = 12,5-3,5$
$4t = 9,0$
$t = \frac{9,0}{4}$
$\boxed{t = 2,25}$
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$8m - 5.5 = 10.1$
Keep the numbers with incognito on the left and the numbers without incognito on the right. Exchanging the signs when changing sides if applicable.
$8m = 10,1 + 5,5$
$8m = 15,6$
$m = \frac{15,6}{8}$
$\boxed{m = 1,95}$