joellabarra joellabarra
  • 28-04-2015
  • Mathematics
contestada

Solve, using the substitution method.

5x + 2y = 7
y = x – 7


A. (7, 0)
B.(3, –4)
C, (0, –7)
D.(–1, –8)

Respuesta :

MrTang
MrTang MrTang
  • 28-04-2015
5x+2y=7
y=x-7

5x=7-2y
5x=7-2(x-7)
5x=7-2x+14
5x+2x=7+14
7x/7=21/7
x=3

y=x-7
y=3-7
y=-4

Answer is B
Answer Link

Otras preguntas

12 Select the correct answer. Which choice best defines citing evidence? OA explaining the steps you took to interpret the text OB. Indicating the extra sources
What can people use to help them deal with emergencies? Credit card. Dining table. Friend's boat. New home.
which permits a single gene to code for more than one polypeptide
How much profit did jamie make if he sold 87tickets for his treasure when he changes r 2.00 per entry and all the prizes have cost him a total of r 69.80
4. What is the difference between formal and informal politics Give an example of each.
use the graph of the parabola to fi in the table​
How did the slave trade make africa vulnerable to the invading powers of europe?
Find -5B. Please help
Match the definition to the term: fuel made from living things a) hydroelectric power b) solar energy c) nuclear fission d) biomass fue
(1) I want my students to respect me. (Changing passive voice)​