Answer:
x=-21
Step-by-step explanation:
x-7=2x+14
-7=x+14
-21=x
Answer: Option 2
Step-by-step explanation:
Let f(y)=x.

Step-by-step explanation:
A compound contains atoms of different elements chemically combined together in a fixed ratio. An element is a pure chemical substance made of same type of atom. ... Compounds contain different elements in a fixed ratio arranged in a defined manner through chemical bonds. They contain only one type of molecule.
Phoebe is correct. The line on the graph would be vertical in the x-axis value of 12.