Question

2x + y = 7
5x + y = 9
Solve the system of equations.

A) (-2/3, 25/3)

B) (2/3, 17/3)

C) 2/3, 25/3)

Answer 1

Does the method matter?

Answer 2

no it doe not.

Answer 3

Eh, lets use substitution, so for that we need to isolate one of the variables x or y from one of the equations then substitute it into the other equation.

So for instance lets take equation 1. 2x+y =7 and solve for y, y = 7-2x

We can take this and sub it into the second equation for y,

5x+(7-2x)=9, now solve for x then once you have x sub it back into one of the original equations and solve for y.

Answer 4

thank you