HELP PLEASE

Select the equivalent expression.

Apatient is given 50 mg dose of medicine the medicines effectiveness decreases every hour at a constant rate of 40% what is the exponential decay function that models this scenario how much medicine will be left in the patients system after 2 hours

X-intercept=-5 y-intercept=2 the equation of the line is

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers