Question 20479: How do I solve this?
3x+4y=-5
5x+6y=-7
Answer by suresh(20)   (Show Source):
You can put this solution on YOUR website! Given equations are:
3x + 4y = -5 --------> (1)
5x + 6y = -7 --------> (2)
Multiply eqn (1) by 5, 15x + 20y = -25 ------->(3)
Multiply eqn (2) by 3, 15x + 18y = -21 ------->(4)
-----------------
Subtract (4) from (3), 2y = -4
y = -2.
Plug y = -2 in eqn (1), we have 3x + 4(-2) = -5
3x=-5+8=3, x = 1.
The solution of the equations are x=1 and y=-2.
|
|
|
