Question

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

Answer 1

First plug in '3' for 'x':

6.4(3) + 2.8y = 44.4

What's 6.4 * 3?

Answer 2

19.2

Answer 3

Yes, now we subtract it to both sides, what's 44.4 - 19.2?

Answer 4

6.4*3+2.8y=44.4 (putting x =3 in the given equation)
19.2+2.8y=44.4
2.8y=44.4-19.2
2.8y=25.2
y=25.2/2.8
y=9

Answer 5

-.-

I thought you were the asker.

Answer 6

What's 44.4 - 19.2? @Rafyy

Answer 7

25.2

Answer 8

Yes, so we have:

2.8x = 25.2

Now we divide 2.8 to both sides, what's 25.2 / 2.8?

Answer 9

2.8y*

Answer 10

9! =D

Answer 11

Yep!