22-06-2016
Mathematics

contestada

What is the solution to the system of equations? y = 2x – 3.5 x – 2y = –14
A.(–7, 3.5)
B.(3.5, –7)
C.(7, 10.5)
D. (10.5, 7)

Respuesta :

23-06-2016

Hello,

Answer C

y=2x-3.5==>2x-7=3.5 (1)
x-2y=-14 (2)

(1)-2*(2)==>3y=28+3.5 ==>y=31.5/3==>y=10.5
x=-14+2*10.5==>x=7
sol={(7,10.5)}

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