Question

x + y = 600
.60x + .30y = .40(600)

Answer 1

we use elimination in this

y = 600 - x

0.60x + 0.30(600 - x) = 0.40(600)

0.60x + 180 - 0.30x = 240

0.60x - 0.30x = 240 - 180

0.30x = 60

x = 60/0.30

x = 200

Answer 2

now we know x we can work out y

x + y = 600

200 + y = 600

y = 600 - 200

y = 400

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Answer 3

30(i1-i2)-15i2=0
30i1+15i2=24

Answer 4

post it again in another question