The number f of miles a helicopter is from its destination x minutes after takeoff is given by f(x)=75−1.5x. The number f of miles a commercial jet is from its destination x minutes after takeoff is shown in the graph below.

9

Step-by-step explanation:

10-1=9

what

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.