How do I position my "2.5D" camera differently

I have a this code attached to my camera targeting my player. It looks at it from a 90 degree angle. I want to move the camera up and back a little. I would I do this? Very knew to coding!

using UnityEngine;
using System.Collections;

public class GameCamera : MonoBehaviour {

private Transform target;
public float trackSpeed = 25;

// Set target
public void SetTarget(Transform t) {
	target = t;
	transform.position = new Vector3(t.position.x,t.position.y,transform.position.z);

// Track target
void LateUpdate() {
	if (target) {
		float x = IncrementTowards(transform.position.x, target.position.x, trackSpeed);
		float y = IncrementTowards(transform.position.y, target.position.y, trackSpeed);
		transform.position = new Vector3(x,y, transform.position.z);

// Increase n towards target by speed
private float IncrementTowards(float n, float target, float a) {
	if (n == target) {
		return n;	
	else {
		float dir = Mathf.Sign(target - n); // must n be increased or decreased to get closer to target
		n += a * Time.deltaTime * dir;
		return (dir == Mathf.Sign(target-n))? n: target; // if n has now passed target then return target, otherwise return n


Line 15 would need changes, it looks like the z position will stay as whatever you move the camera to at the start, so you just change that in the editor as you would normally.

As for the y value you need to add some offset (I have added 5 to the height):

float y = IncrementTowards(transform.position.y, target.position.y + 5, trackSpeed);

Hope that helps,