Inuyasha87 Inuyasha87

20-10-2016
Mathematics

contestada

Use Cramer's rule to solve the following system of equations.

5x + 3y = 7
4x + 5y = 3

A. x = 2, y = —1
B. x = 4, y = 1
C. x = --2, y = —1
D. x = 2, y = 5

Respuesta :

tannerkgibson tannerkgibson

21-10-2016

5x + 3y = 7> (4) 5x + (4) 3y = (4) 7 4x + 5y = 3> (-5) 4x + (-5) 5y = (-5) 3 20y + 12y = 28 -20x -25y = -15 (X's cross out) 12y - 25y = 28 -15 -13y = 13 Y = -1 (Plug in for y) 5x + 3(-1) = 7 5x -3 =7 (add 3 to 7) 5x = 10 (divide by 5) X= 2 Ordered Pair= (2, -1)

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