Question

What is the value o y in the equation 6.4x + 2.8y=44.4, when x=3

Answer 1

y=9

Explanation:

I'm going to write this out in equations, let me know if you want it in words too.

1. 6.4x + 2.8y = 44.4 (subtract 6.4x from both sides to get y alone)

2. 2.8y = -6.4x + 44.4 (divide both sides by 2.8)

3. y = -2.2857x + 15.8571 (substitute 3 for x)

4. y = -2.2857(3) + 15.8571 (multiply -2.2857 by 3)

5. y = -6.8571 + 15.8571 (finish solving)

6. y = 9

Answer 2

9

Explanation:

6.4 x 3=19.2

You move 19.2 to the other side and subtract.

44.4 - 19.2=25.2

Then you do 25.2 divided by 2.8 that will give you 9.