Question

Need help as soon as possible!

Answer 1

`\boxed{ \text{8 p.m.}}`

Explanation:

First, we must plot the graph of your system of equations (see below).

The two lines cross at (12, 360).

Thus, machine A had been going for 12 h. It started at 8 a.m., so it ended at 8 p.m.

Both machines had made 360 ft of wire by
`\boxed{ \text{8 p.m.}}`

Check:

360 = 30 × 12 360 = 40(12 – 3)

360 = 360 360 = 40 × 9

360 = 360

OK.