katiesimmons6746 katiesimmons6746
  • 19-12-2016
  • Mathematics
contestada

What is the solution of 3x + y = 9 and 3x − 5y = 15?

Respuesta :

PurnimaS
PurnimaS PurnimaS
  • 19-12-2016
3x+y=9 ....(1)
3x-5y=15. ......(2)
-[3x-5y=15]
=> 3x+ y = 9
-3x+5y=-15
..........................
0 +6y=-6
so,y=-1
3x+(-1)=9
3x=10
x=10/3
Answer Link
charstar
charstar charstar
  • 19-12-2016
3x+y=9
3x-5y=15

3x+y+6=3x-5y
y+6=-5y
6y=-6
y=-1

3x-1=9
3x=10
x=10/3
x=3 1/3

y=-1
x=3 1/3

Hope this helps :)


Answer Link

Otras preguntas

12x + 7 < -11 or 5x - 8 > 40
The Hubble space telescope is a bus-sized satellite powered by huge ___ panels
Mr. Bhaskar saves Rs.8756 every month. How much money will he save in 13 years ?​
Nicole used her credit card to buy a $1,255 mattress . Her credit card had an APR of 11.56% , compounded monthly, and the mattress was the only purchase on the
pleaseeee help!!!! i'd appreciate it
Based on information in the document, people who wish to stop telemarketers from calling their homes should FIRST
1. Why don't we elect a president directly in America?
What is the surface area of the rectangular prism below? A. 1260 units2 B. 630 units2 C. 846 units2 D. 423 units2
PLZ AWNSER Do you agree or disagree with Malcolm X’s ideas about racism in the United States, black nationalism as a tactic, and the concept of self-defense “by
Does the graph f(x)=-2x^2 -1 have a maximum or a minimum? Explain.