Question

e para hoje
obrigada desde já
quero com cálculo

Answer 1

a) 2x+5x+75=180

7x=180-75

7x=105

x=105/7

x=15

2x=y

2(15)=y

y=30

b) 4/5.x+3.x-10=180

4/5.x+3.x=170

4/5.x+15/5.x=170.5

19/5.x=170.5

19x=170.5/5

19x=170

x=170/19

y=4/5.170/19

y=680/95

y=136/19