02-11-2016
Mathematics

contestada

-x+2y=9
-7x-2y=-1
Solve each system by elimination

Respuesta :

03-11-2016

x - 2y = - 9
7x + 2y = 1

x - 2y = - 9
(+)
7x + 2y = 1
___________
8x = - 8

x = - 1

- 1 - 2y = - 9
2y = 8
y = 4

i am a mathematics teacher. if anything to ask please pm me

Answer Link

Otras preguntas

Prove that 2n + 1 ≤ 2n for n ≥ 3

rachel has a collection of 40 stuffed animals . of the stuffed animals 3/8 are bears and 1/5 are dogs the rest are other animals . how many other animals does s

Susan invests twice as much money at 7.5% as she does at 6%. If her total interest after a year is $840 how much does she have invested at each rate?

Describe the differences between a prokaryotic and a eukaryotic cell, and identify their parts.

Is 4xy + 2y = 9 linear ? If yes write the equation in standard form & determine the x & y interests

There are 21 males in the algebra 1 class. If 75% is female, how many students are there in the class?

Ramiro is 3/10 as tall as the flagpole. The flagpole is 5/9 as tall as the nearby tree. The tree is 32 2/5 feet tall. How tall is Ramiro?

Find the coordinates of point E if C is the midpoint of AE A has the coordinates of (-3,1) C has the coordinates of (-2,-1)

A non-metal usually forms 2 covalent bonds in its compounds.How many electrons will it take in its valence shell？

Susan invests twice as much money at 7.5% as she does at 6%. If her total interest after a year is $840 how much does she have invested at each rate?