Anonym Anonym
  • 28-10-2014
  • Mathematics
Answered

What is the value of x in the equation 4x + 8y = 40, when y = 0.8?

4.6
8.4
10
12

Answer :

ollieboyne
ollieboyne ollieboyne
  • 28-10-2014
y           x
0.8      8.4
 4.6      0.8
 8.4     -6.8
 10     -10
 12     -14
Answer Link
eah
eah eah
  • 28-10-2014
4x + 8y = 40

When y = 0,8 :

4x + 8*0,8 = 40
4x + 6,4 = 40
4x = 40 - 6,4
4x = 33,6
x = 33,6/4
x = 8,4

Answer : 8,4
Answer Link

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