Question

7x-4y=20 for y when x=3

Answer 1

`y=0.25` or
`(1)/(4)`; you first need to plug in the
`x` value, making the equation
`7(3)-4y=20`. Multiply
`7` and
`3` to get
`21` and then subtract it from
`20` in order to isolate the
`y`. This results in
`-4y=-1`. Then divide both sides by
`-4` and the answer would be
`(1)/(4)`, since dividing two numbers that have the same sign results in a positive number and
`(1)/(4)` can not be simplified any further, unless you are looking for the answer in decimal form, in which
`y=0.25`.

Answer 2

Y= 1/4 because 7(3)-4(1/4)