Ash0405 Ash0405

02-02-2015
Mathematics

contestada

Solve by substitution
X+3y=1 and -3x-3y=-15

Respuesta :

Аноним Аноним

02-02-2015

[tex]x+3y=1\\ -3x-3y=-15\\ add\quad the\quad equ.\\ (x+3y)+(-3x-3y)=1-15\\ x-3x+3y-3y=-14\\ -2x=-14\\ x=\frac { -14 }{ -2 } \\ x=7\\ Let's\quad rewrite\quad the\quad equ.\\ 7+3y=1\\ 3y=1-7\\ 3y=-6\\ y=\frac { -6 }{ 3 } \\ y=-2[/tex]

Answer Link

Otras preguntas

Which guidewords would appear on the same dictionary page as the word infer?

how could the following sentence be rewritten as an interrogative sentence? we will be there by seven o’clock. we will be there! you will be there by seven o’cl

which equation represents a circle that contains the point (–2, 8) and has a center at (4, 0)? (x – 4)2 y2 = 100 (x – 4)2 y2 = 10 x2 (y – 4)² = 10 x2 (y – 4)² =

Sets off appositives

what is the sum of 1/9, 2/3,and 5/18? A.19/18 B.4/15 C.12/9 D.8/30

Question 3 (Multiple Choice Worth 3 points) (01.06 LC) Which of the following technologies is focused primarily on heart health? Wrist monitor Smart phone Ba

mr. martin is giving a math test next period. the test, which is worth 100 points, has 29 problems. each problem is worth either 5 points or 2 points. write a s

Why is it important to wear rubber gloves or a plastic face mask? to protect yourself and the victim from the spread of infectious diseases to keep blood or oth

the price of a technology stock was $9.59 yesterday. today, the price rose to $9.66 . find the percentage increase. round your answer to the nearest tenth of a

we _____ each day with a walk around the block. began is beginning begin has begun