garagajo3 garagajo3
  • 14-11-2014
  • Mathematics
contestada

2x—y=7
Y=0.5x+17

0.2x+y=-1.8
Y—5x=6

4x—5y=14
-4x+4=-6

Respuesta :

Jelena
Jelena Jelena
  • 15-11-2014
1.
2x-y=7
y=0.5x+17

y=-7+2x

0,5x+17=2x-7
-1,5x=-24
x=16

2.
0.2x+y=-1.8
Y—5x=6

y=6+5x

0.2x+y=-1.8
0,2x+6+5x=-1,8
5,2x=-7,8 /: (5,2)
x=1,5

3.
4x—5y=14} +
-4x+4[y]=-6

4x-5y -4x+4y=14+6
-y=20
y=-20

4x-5y=14
4x= 14 +5 (-1)
4x=9
x=2,25

Answer Link

Otras preguntas

what is the purpose of including a list of research question in your research plan
Which subatomic particle is electrically neutral and found in the nucleus of an atom?
a television weighs 7.4 kilograms how many grams does the television weigh
The area of a bathroom floor measures 2 yards by 3 yards and each custom tile that makes up the flooring is square feet. How many tiles are needed to cover
3. Overall, did the efforts of the labor unions have a positive impact on workers’ lives and jobs? Explain.
How much of the Earth's surface is covered by water?A. one percent B. half C. three fourths D. 100 percent
Gloria is writing the chemical formula for a compound using its chemical name. She has just identified the names of the elements in the compound. What tool will
What is 20000000000000000 times 56?
How many different 4 member communities can be formed from a group of 15 people? A. 1120 B. 1365 C. 966 D. 925
An element with both metallic and nonmetallic properties is called a _____.