Please tell me an easy way to do dialtions.

2y= 3 2 x−2 y = − 1 3 x + 1 y=− 3 1 x+1

Valentina is subtracting from . she finds the lcd to be 15y2. what is valentina's next step?

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?