Verified Answer :

115912

you plug in the y .8 to the
8 that is 6.4

them you subtract 40 by 6.4
that is  33.6

then you divide that by 4
is 8.4

Exvited

Substitute in 0.8 for y.

\(4x+8y=40 \\ \\ 4x + 8(0.8) = 40 \\ \\ 4x + 6.5 = 40 \\ \\ 4x = 40 - 6.4 \\ \\ 4x = 33.6 \\ \\ x = 8.4 \\ \\\)

The final result is: x = 8.4.

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