02-06-2016
Mathematics

contestada

.07x+.09y=4000
x+y=404.2

Respuesta :

apologiabiology apologiabiology

02-06-2016

times first equation by 100
7x+9y=400000

multiply second equation by -7
-7x-7y=-2829.4

add to other equation

7x+9y=400000
-7x-7y=2829.4 +
0x+2y=397170.6

2y=397170.6
divide by 2
y=198585.3
sub back

x+y=404.2
x+198585.3=404.2
minus 198585.3 both sides
x=-198181.1

(-198181.1, 198585.3)

Answer Link

Otras preguntas

Cos^2x+cos^2x*cot^2x

What property of a corridor's design is most important, allowing it to maximize biodiversity?

Farewell to Manzanar” Why were Japanese-Americans relocated to internment camps during WWII? 2. Explain how Papa “crowded the room,;” it was not merely his phy

in a class of p student the average mark is n and in another class of q student the average mark is n. calculate the average mark of the two classes

¿Avisar y enamorar es una rima asonante o consonante? ES URGENTE. NO PONGAN TONTERIAS SI NO REPORTO GRACIAS :)

One method of reducing the cost of insurance coverage for a child care facility includes which of the following? O Using the lowest deductible the business can

When did slavery start?

Which of the following are categorized as carbohydrates? Sugar, animal proteins, starch Fiber, sugar, starch Starch, fiber, animal proteins Fiber, sugar, animal

What is the slope of the line through (–5,2) and (6,7) in the standard (x,y) coordinate plane? 9 9 5 5 -5 -5 5 11 5 over 11 − 5 11

For every 2 hours, approximately $1,186 worth of product is sold to consumers. How much money will the company for an entire month (30 days)?