danielhodge434 danielhodge434
  • 18-06-2021
  • Mathematics
contestada

Use this system of linear equations to solve for x. 3x+5y=6 and 2x+y=4​

Respuesta :

vannhv02425
vannhv02425 vannhv02425
  • 18-06-2021

Answer:

x=2

HPT 3x+5y=6 (1) và 2x+y=4 (2)

Nhân phương trình (2) với 5 để hệ số y của 2 phương trình bằng nhau. Ta có:

(2)⇔ 10x+5y=20(3)

Trừ (3) cho (1), có: 7x+0y=14⇒x=2

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nthanehlulani
nthanehlulani nthanehlulani
  • 18-06-2021

Answer:

3x+5y=6.....eqn 1

2x+y=4.......eqn 2

y=4-2x.....eqn 3

Step-by-step explanation:

substitute eqn 3 into eqn 1

3x+5(4-2x)=6

3x+20-10x=6

-7x = -14

x=2

Answer Link

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