Rearrange x=3g+2 to make g the suject
explain this to me well

g= (x-2)/3

Step-by-step explanation:

x=3g+2

Subtract 2 from each side

x-2=3g+2-2

x-2 = 3g

Divide each side by 3

(x-2)/3 = 3g/3

(x-2)/3 =g

g= (x-2)/3

Let x and y be speeds of the airplane and wind respectively. Then,

With the wind: x+y = 1120/7 = 160 mph (1)
Against the wind: x-y = 1120/8 = 140 mph (2)

Solving equations (1) and (2)

Add equation (2) and equation (1)
x+y = 160
x-y = 140

2x = 300 => x = 300/2 = 150 mph (speed of airplane in still air)
If the air was still, the airplane would take,

Time to 1120 miles in still air = Distance/speed = 1120/150 = 7.467 hours or 7 hours and 28 minutes.