we have
\(4.2x-1.4y=2.1\)
Solve for y------> that means isolate the variable y
Subtract \(4.2x\) both sides
\(4.2x-1.4y-4.2x=2.1-4.2x\)
\(-1.4y=2.1-4.2x\)
Divide by \(-1.4\) both sides
\(y=-\frac{2.1}{1.4} +\frac{4.2}{1.4}x \\ \\y=3x-1.5\)
therefore
the answer is
\(y=3x-1.5\)
