Solve the systems below:
1. x + 7y = 0
2x - 8y = 22
2. x-y=3
7x - y=-3
3.-9 + 5y = -4x
-11x = -20+9y
4. y = 4x - 9
y=x-3
Tell which method you used to solve each system and why you chose
that method

Check my explanation

Step-by-step explanation:

1. x=-7y

2(-7y)-8y=22

-14y-8y=22

-22y=22

y=-1;x=7, I used subtitution because that process was easier.

2. x=3+y

7(3+y)-y=-3

21+7y-y=-3

21+6y=-3

6y=-24

y=-4; x=-1, I used subtitution because that process was easier.

3. x=1 and y=1, I used elimination because that process was easier.

4. x-3=4x-9

-3x=-6

x=3; y=0, I used subsitution because that process was easier.

it would open into a square depending on the type of envelope i’m not sure about the second part

the image is given below

since the options are not given so we draw it from the equation

the given equation is

y = (x-1) (x+4)

y = y² + 3x - 4

the above equation is a quadratic equation which will have two roots. if we draw the graph for it, it will look like this