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
\(y=3x-1.5\)
