1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Schach [20]
2 years ago
14

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

Mathematics
1 answer:
joja [24]2 years ago
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 3x9x-5x=7#hh&
Paha777 [63]

move the 3 to the 7 side. it will become negative.

9x-5x=7-3

4x=4

x=1

7 0
3 years ago
A patio is rectangular. Its length is 6.21 meters, and its width is 5.7 meters. What is the approximate perimeter of the patio?
Nikolay [14]

Answer:

24

Step-by-step explanation:

6.21+6.21=5.7+5.7=23.82

23.82 rounds to 24

(perimeter is all of the sides combined)

6 0
2 years ago
Solve the equation -2 = 3x/5 + 1
kirill [66]

- 2 =  \dfrac{3x}{5}  + 1 | \times 5 \\  - 10 = 3x + 5 \\  - 3x = 15 | \div ( - 3) \\ x =  - 5

4 0
3 years ago
What is the property used for 0+91=91
Lisa [10]
<u><em>The additive identity property </em></u>. . . is being used here because no matter what the value is, whenever you add zero (0) to it, you'll always get the value your started with.
6 0
2 years ago
Read 2 more answers
Heron’s formula: Area = Triangle PQR has sides measuring 9 feet and 10 feet and a perimeter of 24 feet. What is the area of tria
VladimirAG [237]
Hello,

Let's assume a,b,c the 3 sides of the triangle.

a=9
b=10
c=24-a-b=5

p= \dfrac{a+b+c}{2} =12\\&#10;&#10;S= \sqrt{p(p-a)(p-b)(p-c)} = \sqrt{12*3*2*7} = \sqrt{504} =22,4499...\approx{22}
4 0
3 years ago
Read 2 more answers
Other questions:
  • Cameron classified -18/3 as real, rational, integer and a whole number and a whole number. Is he correct? why or why not?
    11·1 answer
  • Please let me know all of the following that applies, thank you in advance.
    8·1 answer
  • Another question. Help is very much appreciated!<br><br> Thanks!<br><br> (See attachment)
    5·2 answers
  • Two numbers are in ratio of 2 to3 if the smaller number is 18 the larger number is what
    15·2 answers
  • Allam just finished a great meal at a restaurant in Wisconsin. The sales tax in Wisconsin is
    10·1 answer
  • LeAnn is purchasing.giftwrap for a box that measures 10 inches long, 6 inches wide, and 6 inches tall. Calculate the total area
    6·1 answer
  • Let event Aequalssubject is telling the truth and event Bequalspolygraph test indicates that the subject is lying. Use your own
    8·1 answer
  • I'LL GIVE BRAINLIEST: Which measurements could create more than one triangle?
    15·1 answer
  • I have no clue how to do this
    8·1 answer
  • Which graph summarizes a set of data using the minimum value, first quartile, median, third quartile, and maximum value? histogr
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!