18-02-2015
Mathematics

contestada

4x+y=23
3x-y=12 how to do do this

Respuesta :

18-02-2015

[tex] \left \{ {{4x+y=23} \atop {3x-y=12}} \right. \\+---\\add\ both\ equations\\\\ 7x=35\ \ \ | divide\ by \ 7\\\\ x=5\\\\ y=23-4x=23-4*5=23-20=3[/tex]

Answer Link

Otras preguntas

The formula P = 0.672x^2 - 0.046x+ 3 models the approximate population P, in thousands, for a species of frogs in a particular rain forest, x years after 1999.

What is UTF-8 and why was it created?

The molar enthalpy of vaporization of carbon tetrachloride (CCl) 29.82 kJ/mol and the boiling point of carbon tetrachloride is 76.7 °C. Calculate AS for the vap

Name one of the key inventions that made the World Wide Web possible.

I need the answer to this math question. 1) Divide 978 minutes 15 seconds by 43. Need minutes and seconds Round to the nearest hundredth as necessary.

What is the constitutional basis for the implied powers of the federa government? A. They are spelled out in the Bill of Rights. B. They were assumed by the wri

The solution to a system of linear equations is (-3, -3) Which system of linear equations has this point as its solution? A. x-5y = -12 and 3x+2y = -15 B. x-5y

Explain the different variations of the nuclear family and the trends that occur in each.

Simplify the expression. -(10)^-2

700*.135An inventor claims to have developed a heat engine that receives 700 kJ of heat from a source at 500 K and produces 300 kJ of net work while rejecting t