I got 16/63 but i am not sure if its correct or not .

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

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap

What are the solutions of the system? solve by graphing. y = x^2 + 3x + 2 y = 2x + 2