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What is the value of x in the equation 4x + 8y = 40, when y = 0.8? 4.6 8.4 10 12
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5 votes
What is the value of x in the equation 4x + 8y = 40, when y = 0.8?

4.6
8.4
10
12

User Quirico
by
6.6k points

2 Answers

4 votes
y x
0.8 8.4
 4.6 0.8
 8.4 -6.8
 10 -10
 12 -14
User Pogorskiy
by
6.5k points
6 votes
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
User Plastiquewind
by
6.1k points
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