Question

Should you use Substitution or Elimination to solve the system of equations below? Explain your reasoning.

Answer 1

Answer:

We should use substitution method to solve the system.

Step-by-step explanation:

-5x+2y=9.........(1)

y=7x................(2)

putting the value of y from equation 2 in equation 1

-5x+2(7x)=9

-5x+14x=9

9x=9

x=1

putting the value of x in equation 2

y=7(1)

y=7

This equation can be solved easily by this method only.