acantr3ll acantr3ll

13-10-2017
Mathematics

contestada

Solve the system
4x+2y=7 y=5x
A. (1,5)
B. (3,15)
C. (2,10)
D. (0.5,2.5)

Respuesta :

Аноним Аноним

13-10-2017

Attached a solution and showed work.

Ver imagen Аноним

Answer Link

wizard123 wizard123

13-10-2017

Just do a direct substitution.

Replace 'y' with '5x'

4x + 2(5x) = 7

4x + 10x = 7

14x = 7

x = 7/14 = 1/2

Sub into y=5x to find 'y'

y = 5(1/2) = 5/2 = 2.5

Answer:
x = 0.5, y = 2.5

Answer Link

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