toxxicalexxis toxxicalexxis

24-03-2021
Mathematics

contestada

A variable needs to be eliminated to solve the system of equations below. Choose the
correct first step.
-3x - 9y = 36
X - 9y = 12

Respuesta :

viktoria80 viktoria80

24-03-2021

Two different things u can do
Substitution:
X-9y=12
+9y +9y
X=9y+12

-3(9y+12)+9y=36
-27y-36+9y=36
+36 +36
-18y = 72
/-18 /-18
Y = -4

Or whatever this other I’ve is called

-3x-9y=36
-1(X-9y)=(12)-1

-3x-9y=36
-x+9y=-12

-4x=24
X= -6

Answer Link

Otras preguntas

Graph the line by locating any two ordered pairs that satisfy the equation y = 1/4x+1

How does competition increase stability in an ecosystem?

365 times 43 whats the answer

Methane and oxygen react to form carbon dioxide and water. what mass of water is formed if 3.2 g of methane reacts with 12.8 g of oxygen to produce 8.8 g of car

Control rods are used to prevent uncontrolled chain reactions from happening inside nuclear power plants. Based on what you know about nuclear reactions, which

How might you use the table of contents of a book to help you research a topic? A. To identify keywords and their definitions for a report B. To identify the

What is (12x - 32) in simplest form as an expression?

Under the system of which type of federalism is power shifted from the federal to state government

I have been stuck on this for days someone pls help!!!!

Determine the type of triangle that has side lengths of 18, 24, and 42. scalene triangle isosceles triangle equilateral triangle it's not a triangle.