3 years ago

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

1 answer:

3 0

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

You might be interested in

What is x^3=8/27 <br>any help please

r-ruslan [8.4K]

Hope this helps. Good luck

8 0

3 years ago

In which quadrant or on which axis do each of the points (-2,4) , (3,-1) ,(-1,0), (1,2) and

exis [7]

Answer:

Step-by-step explanation:

cartesian plane :

quadrant 1 : both x and y are positive

quadrant 2 : x is negative, y is positive

quadrant 3 : both x and y are negative

quadrant 4 : x is positive and y is negative

(-2,4)......we have x is negative and y is positive...so we are in quadrant 2

(3,-1)....we have x is positive and y is negative...in quadrant 4

(-1,0) ...if u have a 0 in ur points, they do not lie in any quadrant because they are located on an axis....this is located on axis x

(1,2)....both are positive....located in quadrant 1

(-3,-5)...both are negative.....quadrant 3

5 0

3 years ago

What do I do next? I’m confused.

Nina [5.8K]

15 because it’s 3 times the actual amount

6 0

3 years ago

1. The temperature of a body rises from -6°c to 5°c. By how much degrees does it rises? <br>

babunello [35]

It rises 11 degrees

Step by step explanation

3 0

3 years ago

Richard can make 8 dough balls in two hours. If the amount of time is directly proportional to the number of dough balls, how ma

Sergio039 [100]

Answer:

4.5 hours

Step-by-step explanation:

8:2h = 18:x

8x = 18×2h

x = 36h/8

x = 4.5

hope this helps :)

8 0

3 years ago