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

Answer Link

Otras preguntas

Are the numbers 10 and 10% the same? By what percent is the number smaller than the greater one?

To what were Kent State students reacting by stage in their 1970 antiwar protest

__________ he have a son? A Does B Has C Do D Have

In----- theory, the actual wishes that are threatening to the dreamers conscious awareness are disguised

1011111 ÷ 11 in numerical

Read image for instructions

balance this equationPB3 O4 + H2 → PB + H2O

Write the Java code for the calculareDiameter method.

1) The amount of water on Earth is _______ a. always the same. b. constantly changingc. steadily increasing. d. steadily decreasing.2) What controls whether wat

The length of a room is two times its breadth and three times its height . if the cost of white wash on the 4 wall at Rs. 50 per m² is Rs. 7200, find the cost o