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

Tutors, sign in to answer this question.

—

4x + 13y = 40

0 -10y = -80 ----> y = 8

Let's substitute "y" by 8 in first equation

4x + 3*8 = -40 ----> 4x + 24 = -40 ----> 4x = -40 - 24

4x = -64

x = -16

The answer is **(-16, 8)**

4x+13y= 40

4x+3y= -40

___________

subtract equation 2 from equation 1:

4x+13y =40

-4x-3y =-(-40)

______________

10y = 40+40=80

y=8

substitute y=8 in equation 1 or 2

4x+ 3y= - 40

4x + 3 (8) = -40

4x + 24= -40

4x= - 40-24

4x= -64

x = - 16

Already have an account? Log in

By signing up, I agree to Wyzant’s terms of use and privacy policy.

Or

To present the tutors that are the best fit for you, we’ll need your ZIP code.

Your Facebook email address is associated with a Wyzant tutor account. Please use a different email address to create a new student account.

Good news! It looks like you already have an account registered with the email address **you provided**.

It looks like this is your first time here. Welcome!

To present the tutors that are the best fit for you, we’ll need your ZIP code.

Please try again, our system had a problem processing your request.

Randy P.

Discover the mysteries of the world of Math And Physics

$8.75 per 15 min

View Profile >

Chris J.

Experienced Math and Chemistry Tutor

$11.25 per 15 min

View Profile >

Marina B.

Experienced and Patient Stetson U Grad for Math and Science Tutoring

$10.50 per 15 min

View Profile >

## Comments

Thank u