perfectium perfectium

12-02-2018
Mathematics

contestada

20 points!

Solve the linear system of equations using the linear combination method.

8a−4b=20

5a−8b=62

a =
b =

Respuesta :

choixongdong choixongdong

12-02-2018

8a−4b=20 (1st)
5a−8b=62 (2nd)

multiply 8a−4b=20 (1st) by 2
16a −8b = 40 (1st)
5a −8b = 62 (2nd)
-------------------------subtract
11a = - 22
a = -2

8a−4b=20
8(-2) −4b=20
4b = -16 - 20
4b = -36
b = -9

answer
a = -2
b = -9

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