1//Must use backticks, `, in order to work.
2
3let a = 5;
4let b = 10;
5console.log(`Fifteen is ${a + b} and
6not ${2 * a + b}.`);
7
8//Output:
9//Fifteen is 15 and not 20.

1to add a new line forget \n 
2... simply use a new line in the definition
3let a = "a", b="b" 
4console.log(
5`${a}
6${b}`      ); 
7

1let a = 5;
2let b = 10;
3console.log(`Fifteen is ${a + b} and
4not ${2 * a + b}.`);