((pls a girl ))

1.) suppose you send about 12 text messages a day, and your older sister sends more text messages than you do. together, you send a total of about 26 messages per day. about how many text messages does she send a day? write an equation and solve for the unknown value

2.) your father uses text messaging to communicate with his employees. if he sends an average of 19 text messages each day, how many more text messages does he send than you? write an equation and solve for the unknown value.

3.) your parents allow you to have internet access on your cell phone as long as you prepay the bill. if your bill is $17.50 per week, how much would you have to save per day to pay the bill? describe the step-by-step process you use to solve the problem.

1. 26-12=14

2. 19-12=7

3. 17.50 divided by 7=2.5

Step-by-step explanation:

  q

step-by-step explanation:

each line from a vertex to the midpoint of the opposite side is called a median. the point where the medians intersect, point q, is the centroid.

the centroid of δabc is point q.

(0,-3) see attached graph

step-by-step explanation:

a. to solve the system, graph the two equations.

x = y+3 becomes y=x-3 has m=1/1 and b=-3. start at (0,-3) on the y-axis and plot a point. then move up 1 unit and 1 unit to the right. plot a point and connect.

y=-4x+3 has m =-4/1 and b=-3. start at (0,-3) on the y-axis and plot a point. then move down four units and to the right 1 unit. plot a point and connect.

the solution is the point (x,y) where the two lines intersect. by the graph below it is (0,-3).

b. to solve by substitution, substitute y = -4x-3 into x= y+3

x= (-4x-3) +3

x=-4x

5x=0

x=0

now substitute x = 0 back in to find y.

y= -4(0)-3

y=0-3

y=-3

solution is (0,-3)

c. use elimination by adding the equations together.

x-y=3

4x+y=-3

5x=0

x=0

then substitute into one equation to find y.

y=-4(0)-3

y=-3