Algebra-System of equations

Question

 

x=2y

3x+4y=20

 

Solve the system of equations using substitution

Answer 1

x=2y
3x+4y=20

 

substitute x=2y in 3x+4y = 20

 

=> 3 (2y) + 4y = 20

=> 6y + 4y = 20

=> 10y = 20

=> y = 20/10 = 2

 

substituting value of y in any of the 2 initial equations.

 

x = 2y

=> x = 2 (2) = 4

 

there the solution of equations is x = 4, y = 2

 

Let me know if you need any further clarification.

 

Regards,

Venu