Need Help Graphing These Problems?

Question

Solve the system by graphing.
x + y = 4
–x + y = 2

Solve the system by addition.
5x – 4y = –5
x – 2y = –7

Solve the following system of linear inequalities by graphing.
x – y < 3
x + 2y > 6

Solve the following system of linear inequalities by graphing.
3x – y < 2
x + y > 2

Solve the system by graphing.
3x + y = 6
3x – y = 0
If any one can help it will be much appreciated...........By giving the numbers to plot on the graph would be great once again thank you to who ever helps me with this.

Answer 1

for the graphing problems, go to www.quickmath.com, click on Plot under Equations or Inequalities depending on if you have an equation or inequality, click on Advanced, set the Margins to as big as you need them, click plot and you will get your graphs.

5x - 4y = -5
x - 2y = -7


(5x - 4y) + (x - 2y) = -5 + (-7)
5x - 4y + x - 2y = -12
6x - 6y = -12
x - y = -2
x = y - 2

(y - 2) - 2y = -7
y - 2 - 2y = -7
-y - 2 = -7
-y = -5
y = 5

x = 5 - 2 = 3

ANS : (3,5)