What is the value for ƒ(x) = 3^2x-1 when x = 1/2

What is the slope of the line shown below?

X+y=-4 x-y=2 use elimination with adding and subtraction

Afamily has two cars. the first car has a fuel efficiency of 25 miles per gallon of gas and the second has a fuel efficiency of 15 miles per gallon of gas. during one particular week, the two cars went a combined total of 1025 miles, for a total gas consumption of 55 gallons. how many gallons were consumed by each of the two cars that week?