Question

Resolva as equações de 1o grau com duas letras caso 4:
a) 2x – y = 48, y = 10
b) 3x – y = 38, y = 10
c) 4x – y = 30, y = 10
d) 5x – y = 50, y = 20
e) 2x – y = 38, y = 30

Answer 1

a) 2x - 10 = 48

2x = 48 + 10

2x = 58

x = 58/2

x = 29

b) 2x - 10 = 38

2x = 38 + 10

2x = 48

x = 48/2

x = 24

c) 4x - 10 = 30

4x = 30 + 10

4x = 40

x = 40/4

x = 10

d) 5x - 20 = 50

5x = 50 + 20

5x = 70

x = 70/5

x = 14

e) 2x - 30 = 38

2x = 38 + 30

2x = 68

x = 68/2

x = 34