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

Question

asked Feb 6, 2019 222k views

2 Answers

Calco · Answer 1 · 2019-02-09T09:34:30+0000

or

; you first need to plug in the

value, making the equation
7(3)-4y=20

. Multiply

and

to get

and then subtract it from

in order to isolate the

. This results in
-4y=-1

. Then divide both sides by

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

.