Question

Alguém que entenda de equações de 1 grau me ajuda por favor!!!

Answer 1

Resposta:

a) $9x-23=13x-27$

$9x-13x=-27+23\\-4x=-4\\\\x=\dfrac{-4}{-4}\\\\x=1$

b) $4x-4=6x+10$

$4x-6x=10+4\\-2x=14\\\\x=\dfrac{14}{-2}\\\\x=-7$

c) $5x+1=7x-15$

$5x-7x=-15-1\\-2x=-16\\\\x=\dfrac{-16}{-2}\\\\x=8$

d) $4x-1=6x+3$

$4x-6x=3+1\\-2x=4\\\\x=\dfrac{4}{-2}\\\\x=-2$

e) $5x+18=83$

$5x=83-18\\5x=65\\\\x=\dfrac{65}{5}\\\\x=13$

f) $3 \cdot (x+2)=81$

$3x+6=81\\3x=81-6\\3x=75\\\\x=\dfrac{75}{3}\\\\x=15$

g) $2 \cdot (x+1)=140$

$2x+2=140\\2x=140-2\\2x=138\\\\x=\dfrac{138}{2}\\\\x=69$

h) $2 \cdot (x+3)=100$

$2x+6=100\\2x=100-6\\2x=94\\\\x=\dfrac{94}{2}\\\\x=47$

i) $7x+12=96$

$7x=96-12\\7x=84\\\\x=\dfrac{84}{7}\\\\x=12$

j) $5x+32=112$

$5x=112-32\\5x=80\\\\x=\dfrac{80}{5}\\\\x=16$