rooksmichelle3 rooksmichelle3

13-02-2020
Mathematics

contestada

Solve each system of linear equations by elimination. 5x-y=7 4x+8y=-12

Respuesta :

ghanami ghanami

14-02-2020

Answer:

Step-by-step explanation:

hello :

5x-y=7....(*)

4x+8y=-12...(**)

multiply (*) by 8 : 40x-8y =56 ...(***)

add(**) and (***) : 44x = 44 so : x = 1

put this value in (*) : 5(1)-y = 7

y = 5-7 = -2

Answer Link

Otras preguntas

simplify fully 40/56

For each function f, find f^-1 and f^-1(5). f={(-1,5), (0,0), (2,6)}

Explain the different stages in nutrition of amoeba ?

What work must be done to place a satelite of mass 30kg in orbit at a height of 50km above the earth with a velocity of 800m sec?

Identify the domain and range x -5 -2 1 5 7 y 10 11 4 10 15

Explain the different stages in nutrition of amoeba ?

For each function f, find f^-1 and f^-1(5). f={(-1,5), (0,0), (2,6)}

Identify the domain and range x -5 -2 1 5 7 y 10 11 4 10 15

Solve the inequality

Amy thinks of three numbers, which she calls a, b and c. The ratio a: cis 4: 3. The ratio b: cis 7:5. The median of a, b and c is 80. Work out the values of a,