2(3p-1)-7=13

pls help with working

How do i do this using elimination 2x+3y=12 x-y=6

Nnnnneeedd 1.find the residual if you know the actual number is 5.2 and the predicted value is 4.8

Aheated piece of metal cools according to the function c(x) = (.5)x ? 7, where x is measured in hours. a device is added that aids in cooling according to the function h(x) = ? x ? 2. what will be the temperature of the metal after two hours?