Question

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

Answer 1

substitute x=3 into the equation @Rafyy

Answer 2

first substitute 3 for x in the equation, which gets you to 6.4*3 + 2.8y = 44.4.

Answer 3

6.4x + 2.8y = 44.4

Plug in 'x':

6.4(3) + 2.8y = 44.4

Multiply 6.4 * 3

Answer 4

so first just multiply 6.4 and 3. do 6.4*3

Answer 5

\[6.4(3)+2.8y=44.4\]

Answer 6

\[19.2+2.8y=44.4\]

Answer 7

I got 19.2 @iGreen @DuckDynastyfan923

Answer 8

good. now subtract 19.2 from both sides. what is 44.4 - 19.2?

Answer 9

minus 19.2 on both side

Answer 10

25.2

Answer 11

19.2 + 2.8y = 44.4

Subtract.

Answer 12

Yes, so we have:

25.2 = 2.8y

DIvide 25.2 / 2.8

Answer 13

\[2.8y-19.2+19.2=44.4-19.2\]

Answer 14

now divide both sides by 2.8. what is 25.2/2.8?

Answer 15

9 !

Answer 16

now you have x = 9!

Answer 17

Yes! 9 is our answer!