Question

Question #0ac33

Answer 1

`color(blue)("Making "y" the dependant variable")`

Divide both sides by 4

`4/4y=1.4/4x-1/4`

But `4/4=1`

`y=1.4/4x-1/4`

But `1.4/4` is the same as `(1.4xx10)/(4xx10) = 14/40 =(14-:2)/(40-:2)=7/20`

`color(green)(y=7/20x=1/4)`
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`color(blue)("Making "x" the dependant variable")`

I am a bit fed up with the decimal so lets get rid of it.
Multiply everything by 10

`40y=14x-10`

Add 10 to both sides

`40y+10=14x-10+10`

But -10+10=0

`40y+10=14x`

Divide both sides (everything) by 14

`40/14y+10/14=14/14xx x`

`20/7y+5/7=x`

Write as:

`color(green)(x=20/7y+5/7)`
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Substitute any known value into these and you have you answer, However, no known values provided in the question.