For the field trip we bought 30 lunches.
Burgers were $3 and
sandwiches were $2. The
total money spent was
$80. Use elimination to
find the solution.

There are 20 people who had burgers while 10 had sandwiches.

Step-by-step explanation: First you set up the two equations:

x+y=30

3x+2y=80

Then you start the elimination process by making either the x or the y the opposite of one another (I’m using y):

-2x+-2y=-60

3x+2y=80

Eliminate!

x=20

Plug in x to check and solve for y!

for finding the midpoint of any given 2 pair of points simply add the respective x coordinates with other x coordinate and the y coordinate with other y coordinate and divide them by 2

in your question it will be :

(3+1)/2 for the x coordinate of mid point i.e 2

[8+(-4)]/2 for the y coordinate of midpoint i.e 2

so coordinates of mid point of points (3,8) and (1,-4) will be (2,2)