It is the bottom right one because the amount he walked has to be greater than 200
If you plot them you will see that the intersect each other in two different points.
The solution of a system of equations is the set of points of intersection of the graphs of the equations.
The answer is D.
Varies jointly means that y is related to the product of x and z:
.. y = k*x*z
.. 64 = k*8*4
.. k = 64/32 = 2
Then for your new numbers,
.. y = 2*7*6
.. y = 84
60° is 4x 15° because:
I would first divide by 2:
Then divide by 2 again:
That leaves you with a 15° angle.