Question

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

Answer 1

The answer would be 19.2 Yes, now we subtract it to both sides '44.4 - 19.2' and you have your answer 

Answer 2

i think the value of y would be 9
because if you put 3 in place of x the equation would be
6.4(3)+2.8y then you would simplify it to 19.2+2.8y
19.2-44.4=25.5
25.2/2.8=9 which is the value of y

answer=9