3math problem show step by step

1. 7x+ y =10
-7x-10y=26

2. 4x-2y=-14
3x-2y=-14

3. 6x+2y=20
-3x+3y=-30

Step-by-step explanation:

7x+y=10

-7x-10y=26

-9y=36

y=36/-9

y=-4

7x+(-4)=10

7x-4=10

7x=10+4

7x=14

x=14/7

x=2

7(2)+y=10

14+y=10

y=10-14

y=-4

x=2, y=-4. (2, -4).

4x-2y=-14

3x-2y=-14

-(4x-2y)=-(-14)

3x-2y=-14

-4x+2y=14

3x-2y=-14

-x=0

x=0

4(0)-2y=-14

0-2y=-14

2y=0-(-14)

2y=0+14

2y=14

y=14/2

y=7

x=0, y=7. (0, 7).

6x+2y=20

-3x+3y=-30

6x+2y=20

2(-3x+3y)=2(-30)

6x+2y=20

-6x+6y=-60

8y=-40

y=-40/8

y=-5

6x+2(-5)=20

6x-10=20

6x=20+10

6x=30

x=30/6

x=5

x=5, y=-5. (5, -5).

to determine the unit cost your would divide the total cost by the number sold.

7 bagels for $4.41       $4.41/7 = $.63 each at fresh side

5 bagels for $3.60         $3.60/5 = $.72 each at value mart