elizabethyiadop3whmz elizabethyiadop3whmz

03-05-2018
Mathematics

contestada

y + 2.3 = 0.45x

–2y = 4.2x – 7.8

(2.4, –1.2)
(–1, 2.5)
no solution
infinitely many solutions

Respuesta :

Аноним Аноним

03-05-2018

multiply the first equation by 2:-
2y + 4.6 = 0.90x
2y - 0.90x = -4.6
second equation is
-2y - 4.2x = -7.8
Adding:-
-5.1x = -12.4
x = 2.4

-2y = -7.8 + 4.2(2.4) = 2.3
x = -1.2

Answer x = 2.4 and y = -1.2

Its choice A

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