01-11-2020
Mathematics

contestada

Solve the system of equations by the substitution method.
- x + 3y = 7
- 3x + 8y = 19

Respuesta :

delancygenius delancygenius

01-11-2020

- X = 7 -3y

=> X = 3y -7

Now substitute it in 2nd equation!

-3x+ 8y =19

=> -3 (3y- 7) + 8y =19

=> -9y +21 +8y = 19

=> -y = 19-21

=> y = 2

Now x= 3y-7

=> X = 3×2-7

=> X = 6 -7

=> X = -1

Answer Link

Otras preguntas

what is 7/9 divided by 1/3?0 20 2 1/90 2 1/30 3

convert 5 yards per second to feet per minute

i forgot what 25 divided by 12 is lol pls help me

Sam can clean the pool in 5 hours; his coworker Glenn can clean the same pool in 7 hours. One day Sam started to clean the pool by himself and worked for an hou

WILL MARK BRAINLIEST! Which of the following is not a catalyst? A. Phosphorus B. Platinum C. Enzymes D. Nickel

do protons and neutrons circle the nucleus?

1 How did Nicholas address social unrest?

Help asap i will do brainlist and everything

check if 7 is a solution of the equation 4 ( Z - 3 ) = 16. step by step plz guys.

Objectivity in observation is important because a. Interpretations do not belong in observation b. It allows you to be an effective observer by describing child