Question

Resolva as equações a seguir em Z

a) 9x-2=4x+18

b)2x-10+7x+10=180

c)7y-10=j+50

d)4x-18+3x=10

e)2x+5+x+7=18

f)5x-91=4x-77

g)7x+1=5x-7

h)4x+5=x+20
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Answer 1

Resposta:

a) 9x-2=4x+18

$9x-2-4x-18=0\\5x-20=0\\5x=20:(5)\\x=4$

b)2x-10+7x+10=180

$2x-10+7x+10-180=0\\9x-180=0\\9x=180:(9)\\x= 20$

c)7y-10=j+50

$7y-10-y-50=0\\6y-60=0\\6y=60:(6)\\x=10$

d)4x-18+3x=10

$4x-18+3x-10=0\\7x-28=0\\7x=28:(7)\\x=4$

e)2x+5+x+7=18

$2x+5+x+7-18=0\\3x-6=0\\3x=6:(3)\\x=2$

f)5x-91=4x-77

$5x-91-4x+77=0\\x-14=0\\x=14$

g)7x+1=5x-7

$7x+1-5x+7=0\\2x+8=0\\2x=-8:(2)\\x=-4$

h)4x+5=x+20

$4x+5-x-20=\\3x-15=0\\3x=15:(3)\\x=5$