Question

Rezolvati in multimea numerelor reale ecuatiile
A) -15x=20
B) 18x=-15
C) -7x=-21
D) -9x=-24

Answer 1

a)x=20:(-15)=-4/3
b)x=-15:18=-5/6
c)x=-21:(-7)=3
d)x=-24:(-9)=8/3

Answer 2

$a) - 15x = 20 \: | \div ( - 5)$

$3x = - 4$

$x = - \frac{4}{3}\:\epsilon\:\mathbb{R}$

$b)18x = - 15 \: | \div 3$

$6x = - 5$

$x = - \frac{5}{6}\:\epsilon\: \mathbb{R}$

$c) - 7x = - 21 \: | \div ( -7 )$

$x = 3\:\epsilon\:\mathbb{R}$

$d) - 9x = - 24 \: | \div ( - 3)$

$3x = 8$

$x = \frac{8}{3}\:\epsilon\: \mathbb{R}$