Answer:
now first of all we should plug in 0.8 to y .
now we have this simple equation: 4x+8.(0.8)=40
4x+6.4=40
4x=33.6
x=8.4 (hope it helps :) )
Step-by-step explanation:
Answer:
[tex]4x + 8y = 40 \\ 4x + 6.4 = 40 \\ 4x = 40 - 6.4 \\ 4x = 33.6 \\ x = 8.4[/tex]