Question

9. Margie and Glenn are trying to solve the following system of equations.

5x - 4y= 23
7x + 8y = 5
Glenn thinks that the elimination method will not work. Margie is not so sure about that.
With your team, decide whether Glenn is correct and write a few sentences justifying
your conclusion. If the elimination method will work, show how. If not, use another
method to solve the system.

Answer 1

5x - 4y = 23 x 2
7x + 8y = 5

10x - 8y = 46
7x + 8y = 5

17x = 51
X = 51/17
X = 3

7(3) + 8y = 5
21+8y = 5
8y = 5 - 21
8y = -16
Y = -16/8
Y = -2