[6.02] Solve the following system.
y = x + 3
2x + y = 9

(2, 5)

(5, 2)

(−2, 5)

(2, −5)

Question

[6.02] Solve the following system.
  y = x + 3
2x + y = 9

 (2, 5)

 (5, 2)

 (−2, 5)

 (2, −5)

anonymous · Answer

Do you know how to solve simultaneously?

anonymous · Answer

i'm just very confused with this whole lesson

anonymous · Answer

Okay - ill go through it with you
So, you have ben given two equations.

anonymous · Answer

We want to know what x is so that it satisfies both equations.

anonymous · Answer

Okay

anonymous · Answer

To do this, there is a method of subtitution.

anonymous · Answer

You have been given  the equation (y= x+3)
You have two unknows - x and y

anonymous · Answer

The first step is to substitute (y= x+3) into the the equation 2x+y=9

So you get: 
2x+y =9

2x+(x+3)=9


Are you able to solve this?

anonymous · Answer

Do I solve the second one only?

anonymous · Answer

Yes, solve the second one

anonymous · Answer

HINT: 2x + (x+3) = 9
3x +3 = 9

anonymous · Answer

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