Question

Solve each system by elimination:

11 - 5y = 2x
5y + 3 = -9x

and

2x + 3y = 4
4x + 6y = 9

Answer 1

-5y + 11 = 2x
5y + 3 = -9x
---------------add
14 = - 7x
-14/7 = x
-2 = x

5y + 3 = -9x
5y + 3 = -9(-2)
5y = 18 - 3
5y = 15
y = 15/5
y = 3

solution is : (2,3)
==========================
2x + 3y = 4....multiply by -2
4x + 6y = 9
--------------
-4x - 6y = -8 ...result of multiplying by -2
4x + 6y = 9
--------------add
0 = 1....(incorrect)

there is no solution for this system