Question

4.2x -1.4y = 2.1 solve for y

Answer 1

we have

$4.2x-1.4y=2.1$

Solve for y--------> clear the variable y

$4.2x-1.4y=2.1$

Subtract from both sides $4.2x$

$4.2x-1.4y-4.2x=2.1-4.2x$

$-1.4y=2.1-4.2x$

Divide both sides by  $-1.4$

$y=(2.1-4.2x)/(-1.4)$

$y=-\frac{2.1}{1.4} +\frac{4.2x}{1.4}\\ \\y= -1.5+3x\\ \\y=3x-1.5$

therefore

the answer is

$y=3x-1.5$

Answer 2

we have

$4.2x-1.4y=2.1$

Solve for y--------> clear the variable y

$4.2x-1.4y=2.1$

Subtract from both sides $4.2x$

$4.2x-1.4y-4.2x=2.1-4.2x$

$-1.4y=2.1-4.2x$

Divide both sides by  $-1.4$

$y=(2.1-4.2x)/(-1.4)$

$y=-\frac{2.1}{1.4} +\frac{4.2x}{1.4}\\ \\y= -1.5+3x\\ \\y=3x-1.5$

therefore

the answer is

$y=3x-1.5$

Answer 3

4.2x - 1.4y= 2.1....for y
-1.4y = -4.2x + 2.1
y = (-4.2/-1.4)x - 2.1/1.4
y = 3x - 1.5