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

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

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

Hello! i hope this
since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.