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

Which sentence contains an adverb clause? A.There is an interesting exhibit right now about Native American artifacts. B.No, I haven't been to a museum since m

The sum of the measure of two angles is 183.6 degrees. On angle has measure of 54 degrees. What is m, the measure in degrees of the second angle

Regular Hexagon ABCDEF rotates 240' counterclockwise about its center to produce hexagon A'B'C'D'E'F'. Which points will A' and B' coincide within the pre image

Jan's scores on five quizzes were 2, 8, 8, 9, and 10. Is the mean or median the best measure of center to summarize Jan's scores? A.median B.mean C.Both mean a

What was the result of the collision of the two tectonic plates

What are the roots of the equation x2 + 4x - 16 = 0?

Simplify. 5 – [–(–2)] A. –3 B. 3 C. –7 D. 7

Serfs were not required to provide labor services for the manor. true false

An office building casts a 90 foot shadow. At the same time of day, a 5 foot woman standing near the building casts an 8 foot shadow. What is the approximate he

Which of the following types of edits to direct quotes is inappropriate? Select one: a. Using brackets to add clarifying text b. Leaving out text with an ellip