Search 75,767 tutors
FIND TUTORS
Ask a question
0 0

Use addition or substitution to find the value of y for this set of equations. top line 4x + 13y = 40 bottom line 4x + 3y = -40

Tutors, please sign in to answer this question.

1 Answer

Using the addition method, you could first multiply one equation by -1

then add to eliminate the x variables. 

Let's multiply the second equation by -1 to give us:

4x   +  13y  =  40

-4x  +  (-3y) =  40  

adding gives us

           10y  =  80

               y  =  8  (dividing both sides by 8)

If you also needed to find x, you could then substitute

the value of 8 in for y in one of the equations and solve for x.

 

Comments

Comment