Solve for x x + y = 1 x + 7y = -4 2x - 6y = 4 5x + 15y = -10 2x + 6y = 10

X + y = 1
add - y both sides
x + y +  - y = 1 +  - y
x =  - y + 1
x =  - y + 1
Graph: y =  - x + 1

x + 7y =  - 4
add - 7 both sides
x + 7y +   - 7y = - 4 +  -7y
x =  - 7y  - 4
x = - 7y   - 4
Graph: y = 0.142857x  -  0.571429

2x  - 6y = 4
add 6y to both sides
2x  - 6y + 6y = 4 + 6y
2x = 6y + 4
divide both sides by 2
2x/2 = 6y + 4/2
x = 3y + 2
x = 3y + 2
Graph: y = 0.333333x  -  0.666667

5x + 15y = - 10
add - 15 to both sides
5x + 15y +   - 15y = - 10 +  - 15y
5x = - 15y  - 10
divide both sides by 5
5x/5 =  - 15y - 10/5
x = - 3y  - 2
x = - 3y - 2
Graph: y =  - 0.333333x  -  0.666667

2x + 6y = 10
add - 6y to both sides
2x + 6y +  - 6y = 10 +  - 6y
2x =  - 6y + 10
divide both sides by 2
2x/2 = - 6y + 10/2
x =  - 3y + 5
x =  -3y + 5
Graph: y =  - 0.333333x  +  1.666667

Hope that helps!!!