Graphing, HELP PLEASE!! ordered pairs and tables??

Question

Im helping my sister with her math and I was able to help her with 50 out of 55 questions, if someone could help with a couple I would really be happy!
1- Select the ordered pairs in the table whose coordinates do NOT satisfy the equation x+2y=6 in the x column the #s are (top to bottom) 12, 6, 4, 8, -2. in the y column they are (top to bottom) 6, 8, 1, -1, 4. I selected x4, y1 and x8,y-1 but she thinks that is wrong.

2-Plot 2 ordered pairs whose coordinates satisfy the equation -2x - y = -1. What are the coordinates?

3- Complete the table to find 3 ordered pairs wose coordinates satisfy the equation x=3. x column (top to bottom) are BLANK (needs filled in) y column(top to bottom) -1.6, 48, 0.5.

4-which is true for the graph equation x=4?
a-the graph is a horizontal line
b-the graph is a vertical line
c-the graph is a line that pass through (0,0)
d-the graph is none of the above
I selected B but she thinks its wrong.

Answer 1

1. Your sister is right. Both of those satisfy the equation. Plug in x and y and see if it works.
12 + 2(6) = 6 NOT so 12, 6 is one answer
6 + 2(8) = 6 NOT so 6, 8 is the other
4 + 2(1) = 6 yes
8 + 2(-1) = 6 yes
-2 + 2(4) = 6 yes (just as a sanity check)

2. pick an x or y and fill in the other. To be easy, lets use x=0:
0 - y = -1 so y = 1 and the pair is (0, 1). Now try y=0:
-2x - 0 = -1 which means -2x = -1 SO x = 1/2 (1/2, 0) is another pair. Plot the two dots and draw straight line between them

3. Does not parse. The equation x=3 has no y values.

4. The x axis goes like ----------------------------
so x = 4 would be a vertical line through the axis at 4. You got that one right.

Answer 2

1. Just substitute the values of the x,y ordered pairs into the equation and check it out. The two you picked satisfy the equation. 12,6 doesnt and 6,8 doesnt.

2. if y=0, x=+1/2
if x=0, y=1
so 2 ordered pairs are (0,1) and (1/2,0)

3. The equation x=3 say just that, y doesn't enter into the solution. So all coordinate pairs that satisfy this will have an x=3 to start and any y you want to cite.

4. (b) is correct, just look at question 3 above.

Answer 3

What precisely are you asking for? The graph? The table? you have the equation: 3x + y = 2 replace anybody huge style in for x or y and choose the single you probably did no longer replace in. i.e. if x = 0: 3(0) + y = 2 so y = 2 while x = 0 so on etc