Question

calcule as equações com incógnitas
a) 10y=15+9y
b)17x+40=21x
c)5x+1=36
d)6x+2-5x=9​

Answer 1

a) 10y = 15 + 9y

10y - 9y = 15

y = 15

b) 17x + 40 = 21x

17x - 21x = - 40

- 4x = - 40 . (-1)

4x = 40

x = 40

-----

4

x = 10

c) 5x + 1 = 36

5x = 36 - 1

5x = 35

x = 35

-----

5

x = 7

d) 6x + 2 - 5x = 9

6x - 5x = 9 - 2

x = 7