how to solve 4X-5y=11,7x+9y=3 USING ELIMINATION
The eqns are:
4x - 5y = 11
7x + 9y = 3
Let's eliminate the y's say, by multiplying the 1st eqn by 9 and the 2nd eqn by 5.
This gives us,
36x - 45y = 99
35x + 45y = 15
Now simply add the two eqns together, to give
71x = 114
x = 114/71
Substituting for x = 114/71 in the 1st eqn, we get
4(114/71) - 5y = 11
456/71 - 11*(71/71) = 5y
456 - 781 = 71*5y
-325 = 71*5y
-65 = 71y
y = -65/71
Answers: x = 114/71, y = -65/71