shelly3344 shelly3344

23-01-2017
Mathematics

contestada

solve the system of equations by substitution.

3x + 4y = 31

2x - 4y= -6

A. (4, 5)
B. (5, 4)
C. (-5, 12.5)
D. (5, -4)

Respuesta :

tristanluedke tristanluedke

23-01-2017

The correct answer is B. (5,4).
If you combine the like terms of both equations you get 5x=25
Divide both sides by 5 to isolate the variable.
x=5, plug 5 into the top equation.
3(5)+4y=31
15+4y=31
4y=16
y=4
x=5 y=4

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