system of equations........?

Question

What are these systems of equations?

1. 3x - 2y =10
5x + 3y =4
(2, -2)
(-2, 2)
(2, -5)
(-2, 5)

2. x + y = 4
y = 2x + 1
(3, 1)
(1, 3)
(2, 2)
(-2, 2)

Answer 1

Question 1
9x - 6y = 30
10x + 6y = 8------ADD

19x = 38
x = 2

10 + 3y = 4
3y = - 6
y = - 2

x = 2 , y = - 2

Question 2
x + 2x + 1 = 4
3x = 3
x = 1

y = 2 + 1
y = 3

x = 1 , y = 3

Answer 2

1. 3x - 2y =10
5x + 3y =4

15x - 10y = 50
15x + 9y = 12
19y = -38
y = -2
3x - 2(-2) = 10
3x + 4 = 10
3x = 6
x = 2
x = 2, y=-2 --> (2,-2)

2: x + y = 4
y = 2x + 1

x + (2x + 1) =4
3x+ 1 = 4
3x = 3
x = 1
y = 2(1) + 1
= 3
x = 1, y = 3 --> (1,3)