The first line in the system of equations is graphed on the coordinate plane. graph the second line to find the solution to the
system.
2x-3y = -6
y=-x-4

See attachment.

Step-by-step explanation:

The given system is  

The first line is already graphed.

We want to graph

We can do this by plotting two points and drawing a straight line through them.

When we choose x=0, we substitute into the equation and solve for y.

So we plot (0,-4)

Also, when y=0, we substitute and solve for x.

So we plot the point (-4,0)

We now use a straight edge to draw a straight line through these two points to obtain the graph shown in the attachment.

the answer is 31.27mph