Answer:
As the product of the slop of both lines is -1.
Therefore, the given equations are perpendicular.
Step-by-step explanation:
Given the equations


The slope-intercept form of the equation is

where m is the slope and b is the y-intercept.
Writing both equations in the slope-intercept form


So by comparing with the slope-intercept form we can observe that
slope of equation = 3
i.e.

also



So by comparing with the slope-intercept form we can observe that
the slope of equation = -1/3
i.e.

as
The slope of the perpendicular line is basically the negative reciprocal of the slope of the line.
so
The slope
is the negative reciprocal of the slope 
Also, the product of two perpendicular lines is -1.
i.e.

VERIFICATION:
It is clear that the product of the slop of both lines is -1.


Therefore, the given equations are perpendicular.
Answer:
$3.80 per book
Step-by-step explanation:
I divided 19 by 5 to get the price per book
Answer:
C
Step-by-step explanation:
The equation of a line in slope- intercept form is
y = mx + c ( m is the slope and c the y- intercept )
Rearrange 3x + 2y = 7 into this form
Subtract 3x from both sides
2y = - 3x + 7 ( divide all terms by 2 )
y = -
x +
← in slope- intercept form
with y- intercept c =
→ C
50 divided by 4 is 12.5 so there is about 12 or 13 students on each bus.