¿Cómo puedes usar variables y expresiones para representar situaciones reales? PD: lo necesito rápido para ya si se puede

Find an equation for the linear function which has slope -10 and x-intercept -7

What is the distance between point a and b

Graph the line that represents a proportional relationship between d and t with the property that an increase of 33 units in t corresponds to an increase of 44 units in d. what is the unit rate of change of dd with respect to t? (that is, a change of 11 unit in t will correspond to a change of how many units in d? )