26chavezy 26chavezy

07-03-2022
Mathematics

contestada

Solve the system of equations.
7x - 3y =20
Y= 5x - 4

X=
Y=

Respuesta :

ramjaysahota ramjaysahota

07-03-2022

7x=20+3y
X=(20+3y)/7

Y=5x-4
Y=5((20+3y)/7)-4
Y=((100+15y)/7)-4
7y=100+15y-28
7y=72+15y
7y-15y=72
-8y=72
Y=-9

7x-3y=20
7x-3(-9)=20
7x+27=20
7x=20-27
7x=-7
X=-1

Answer Link

Otras preguntas

If a tower casts a shadow 11 feet long the distance from the top of the tower to the end of the shadow is 61 feet .. How many feet tall is the tower

please help Most U.S. citizens are a. non-pledged b. naturalized c. native d. noncitizens it is not b thank u

what is q+3≥9 or 9q+5<14

-9 + (-2)²help!! see im trying to get math done so i need help

please help Most U.S. citizens are a. non-pledged b. naturalized c. native d. noncitizens it is not b thank u

In what ways did the British treat the patriots harshly? Was this a good or a bad idea ? Why?

If rounded to the nearest dime, what is the greatest amount of money the rounds to $105.40? What is the least amount of money that rounds to $105.40? Explain y

35% of what number is 42

Karens batting average was 0.444. She was at bat 45 times. How many hits did she get?

which of the following events is a part of the light reaction of photosynthesis ? a - production of carbohydrates b - splitting up of the water molecules c -