Question

Dada a equação 5x + y = 11, determine a sua solução quando:
a) x = 0
b) x = 2/5
c) c = -2
d) x = 1,6

Answer 1

5x + y = 11, determine a sua solução quando:
a) x = 0

b) x = 2/5

c) x = -2

d) x = 1,6

a)

5x + y = 11
5.0 + y = 11
0 + y = 11
y = 11

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b)
x =  2
      ----
        5

5.   2   +   y = 11
    -----
      5

2 + y = 11
y = 11 - 2
y = 9

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c)

x = - 2
5x + y = 11
5.(-2) + y = 11
- 10 + y = 11
y = 11 + 10
y = 21

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d)
x = 1,6

5x + y = 11
5.1,6 + y = 11
8 + y = 11
y = 11 - 8
y = 3

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