5x2y=42
3x+4y=20
2x+4y=48
4x+2y=66
3x+4y=20
2x+4y=48
4x+2y=66

5x2y=42
3x+4y=20
multiply 2 to the first one
10x  4y = 84
3x + 4y = 20
Add
13x = 104
x = 104/13 = 8
Substitute into either equations to find y
x = 8 then y = 1
*************************
2x+4y=48
4x+2y=66
Multiply first with 2
4x + 8y = 96
4x + 2y = 66
Subtract
6y = 30
y = 5
so
x = 14
3x+4y=20
multiply 2 to the first one
10x  4y = 84
3x + 4y = 20
Add
13x = 104
x = 104/13 = 8
Substitute into either equations to find y
x = 8 then y = 1
*************************
2x+4y=48
4x+2y=66
Multiply first with 2
4x + 8y = 96
4x + 2y = 66
Subtract
6y = 30
y = 5
so
x = 14

1).
5x  2y = 42
3x + 4y = 20
10x  4y = 84
13x = 104
x = 8
y = 1
2).
2x + 4y = 48
4x + 2y = 66
8x + 4y = 132
6x = 84
x = 14
y = 5
5x  2y = 42
3x + 4y = 20
10x  4y = 84
13x = 104
x = 8
y = 1
2).
2x + 4y = 48
4x + 2y = 66
8x + 4y = 132
6x = 84
x = 14
y = 5