13-03-2015
Mathematics

contestada

Solve the equation with substitution 3x-2y=9 Y=2x-7

Respuesta :

13-03-2015

[tex]3x-2y=9 \\ y=2x-7 \\ \\ \hbox{substitute 2x-7 for y in the 1st equation:} \\ 3x-2(2x-7)=9 \\ 3x-4x+14=9 \\ -x+14=9 \ \ \ |-14 \\ -x=-5 \ \ \ |\times (-1) \\ x=5 \\ \\ y=2x-7=2 \times 5-7=10-7=3 \\ \\ \boxed{(x,y)=(5,3)}[/tex]

Answer Link

Otras preguntas

Arco company has two divisions - mixers and food processors. arco company segmented income statements for the current fiscal year ended december 31 mixer food p

Astronomy A star’s light is shifted to the blue part of the light spectrum. What does this mean about the length of light waves and movement of the star? Ple

Which bodies are composed primarily of rock and metal? A) comets and stars B) stars and meteors C) comets and asteroids D) asteroids and meteors

Choose the correct simplification of the expression the quantity a to the 2nd power over b to the 3rd power all raised to the 4th power.

women tend to use ____ brain hemisphere(s) when performing verbal and spatial tasks, whereas men are more likely to use ____ hemisphere(s) for each of these fu

there are 8 hooks in a display of pens. Each hook can hold 3 packages of pens and there are 3 pens in each package. If the display is completely full, how many

A train travels 200 miles in 4 hours, going the same distance each hour. How many miles does the train travel each hour?

Overweight individuals who lose even relatively small amounts of weight are likely to:

Calculate the approximate distance point A (5, 3, −2) and point B (2, −4, 8) are from the origin. Round to the nearest tenth.

If a person misses a meal which hormone is more likely to be secreted the stimulates r pancreas