MAddycat2000 MAddycat2000
  • 21-07-2015
  • Mathematics
contestada

Which of the following ordered pairs is a solution to the equation 2x+7y=8?
A. (3,-2)
B. (2,-3)
C. (-3,2)
D. (0,4)

Respuesta :

naǫ
naǫ naǫ
  • 21-07-2015
Plug the values (x,y) into the equation and check if they satisfy the equation.

[tex](3,-2) \\ 2 \times 3 + 7 \times (-2)=8 \\ 6-14=8 \\ -8=8 \\ not \ true \\ \\ (2,-3) \\ 2 \times 2+7 \times (-3)=8 \\ 4-21=8 \\ -17=8 \\ not \ true[/tex]

[tex](-3,2) \\ 2 \times (-3)+7 \times 2=8 \\ -6+14=8 \\ 8=8 \\ true \\ \\ (0,4) \\ 2 \times 0+7 \times 4=8 \\ 0+28=8 \\ 28=8 \\ not \ true[/tex]

The answer is C.
Answer Link

Otras preguntas

Over the past 50 years, the South has undergone a change from an agriculture-based economy to an industry-based economy. This change is known asA)manufacturing.
What is the percentage of water in the hydrate CoCl2 • 6H2O? Can someone help me with this one?
Which pair of numbers is relatively prime?    A. 18 and 45   B. 26 and 91   C. 10 and 33   D. 14 and 63
Simplify the square root of 9/16.
What is the solution of the system of equations c+3d=8 and c=4d-6? Show work plz.
How to factor completely:  15x²-40x-15
solve 2cos^2x+5cosx+2=0
Welsh language, literature,music,and culture are promoted at the festival.What is the complete predicate? Please help me! :)
-2(b+12)+6b is simplified to what?
In order to determine speed, you must know a.time.c.Both (a) and (b)b.distance.d.None of the above