zahriaaaaa zahriaaaaa

27-11-2017
Mathematics

contestada

substitution
-2x-y=-9
5x-2y=18

Respuesta :

dannielle dannielle

07-12-2017

- 2x - y = - 9 | +9
- 2x + 9 - y = 0 | +y
9 - 2x= y

5x-2y=18
5x- 2* (9-2x) = 18
5x - 2*9 -2 *(-2x)= 18
5x - 18 + 4x = 18 | +18
9x = 18+18=36
x=36:9
x=4

y= 9 - 2*4
y=9 - 8
y= 1

Answer Link

Otras preguntas

Given that R equals 2x plus 2y find y when x equals 9 and R equals 29 give your answer as an improper fraction in its simplest form

write 25 times 10^6 in standard form

Consider the insoluble compound nickel(II) hydroxide , Ni(OH)2 . The nickel ion also forms a complex with cyanide ions . Write a balanced net ionic equation to

Solve 2x + 2 > 10. O A. x>4 O B. X>6 O c. x< 6 O D. x<4

Find the size of angle XYZ. Give your answer to 1 decimal place. Z. 13 cm x Y 4 cm

In light of your personal conservation effort, consider the balance of personal choices and societal measures to force change. What societal/governmental measur

Which of these statements is correct?a. A globe is more accurate than a map as it follows the curvature of the Earth. It is therefore able to give the correct s

Melanie needs to ensure that readers are able to locate specific sections within a document easily. What should she include in the document? concordance index t

Balance the following equations: 1. Mg(OH)2 + H3AsO4 → Mg3(AsO4)2 + H2O 2. NH4NO3 → N2O + H2O 3. AsCl3 + H2O → H3AsO3 + HCl 4. C4H10O2 + O2 → CO2 + H2O Use the

The diagonal of a rectangle is 58" the site is 40" and the base is 42" what is the ratio of the diagonal to the base of the rectangle