Question

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

Answer 1

$put \: the \: value \: of \: x$
$(6.4 \times 3) + 2.8y = 44.4 \\ 19.2 + 2.8y = 44.4 \\ 2.8y = 44.4 - 19.2 \\ 2.8y = 25.2 \\ y = \frac{25.2}{2.8 } \\ y = 9$

Answer 2

$\huge\bold{Solution}$

$6.4x + 2.8y = 44.4 \\ \\ when \: \: x = 3 \\ \\ = > 6.4(3) + 2.8y = 44.4 \\ \\ = > 19.2 + 2.8y = 44.4 \\ \\ = > 2.8y = 44.4 - 19.2 \\ \\ = > 2.8y = 25.2 \\ \\ = > y = \frac{25.2}{2.8}$

=> y = $\huge\boxed{ 9 }$

$\textbf{Hope it helps!!}$