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Anonymous Anonymous
  • 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

Verified 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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