Respuesta :

Answer:

when you =0.8=4/5

4x + 8(4/5)=40

4x=40-32/5

4×=(200-32)/5

x=168/20

Step-by-step explanation:

4x+8y=40, when y=0.8

4x+8(0.8)=40

4x+6.4=40

4x=40-6.4

4x=33.6

x=33.6/4

x=8.4

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