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krek1111 [17]
3 years ago
14

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

Mathematics
2 answers:
Naya [18.7K]3 years ago
8 0
4x + 8y = 40 

When y = 0.8
4x + 8(0.8) = 40
4x + 6.4 = 40
4x = 40 - 6.4
4x = 33.6
x = 8.4

--------------------------------------------------------
Answer: x = 8.4
--------------------------------------------------------


storchak [24]3 years ago
3 0
To find your answer you must substitute y for 0.8
4x + (8)(0.8) = 40
Now solve for x
====================================================================
SOLVING...

<span>4x + (8)(0.8) = 40
</span><span>4x + 6.4 </span>= <span>40
</span>
Subtract 6.4 from each side
<span><span><span>4x</span>+ 6.4 </span>− 6.4 </span>= <span>40 − <span>6.4
</span></span>4x = 33.6

Divide each side by 4
4x ÷ 4 = 33.6 ÷ 4
x = 8.4
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