Plz plz plz on number 6,7,8,9 i would greatly appre and whoever gets it get brainliest

6: Yes, it is linear. The constant rate of change is , which you can make . This simplifies to 15, so the constant rate of change is 15.

7. Yes, a proportional relationship exists because every output value is exactly three times every corresponding input value.

8. Yes, a proportional relationship exists because every output value is exactly  times the corresponding input value.

9. Yes, a proportional relationship exists because every y value is 7.5 times every corresponding x value, and if a line were to be drawn through the points, it would go through the origin (0,0).