Question

{3 x + 4 Y = 2
{2 x + 5Y = -1

Answer 1

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

15x + 20y = 10
-8x -20y = 4

7x = 14
x= 14/7
x= 2

3.2 + 4y = 2
6 + 4y = 2
4y = 2 - 6
4y = -4
y = -1