Question

2) Calcule a raiz ou zero da função do 1º grau:
a) y = - 2x + 50 b) y = - 3x + 18



c) y = - 5x + 30 d) y = 2x - 8

e) y = 3x – 15 f) y = - 8x + 16


g) y = - 9x + 18 h) y = - 5x + 25




i) y = - 3x + 12 j) y = 8x + 32

k) y = - 7x + 21 l) y = - 3x + 27

Answer 1

a) -2x + 50 = 0

2x = 50

x = 25

b) -3x + 18 = 0

3x = 18

x = 6

c) -5x + 30 = 0

5x = 30

x = 6

d) 2x - 8 = 0

2x = 8

x = 4

e) 3x - 15 = 0

3x = 15

x = 5

f) -8x + 16 = 0

8x = 16

x = 2

g) -9x + 18 = 0

9x = 18

x = 2

h) -5x + 25 = 0

5x = 25

x = 5

i) -3x + 12 = 0

3x = 12

x = 4

j) 8x + 32 = 0

8x = -32

x = -4

k) -7x + 21 = 0

7x = 21

x = 3

l) -3x + 27 = 0

3x = 27

x = 9