Question

resolva as equações:
a) 15x-45=65

b)25x-16=14-13x

c)10y-7(1+y)=4(2y-2)-10

Answer 1

a) 23/3
b) 15/9
c)11/5

Answer 2

a) 15x-45=65
15x=65+45
15x=110
x=  110  
       15
simplifica por 5
x=   22   
        3
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b)25x-16=14-13x
25x+13x=14+16
38x=30
x= 30 
     38
simplifica por 2
x= 15 
     19
-----------------------

c)10y-7(1+y)=4(2y-2)-10
10y-7-7y=8y-8-10
10y-7y-8y=-8-10+7
-5y=-11  (-1)
5y=11
y= 11 
      5