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
tiny-mole [99]
3 years ago
7

X + 2y = –6 3x + 8y = –20

Mathematics
1 answer:
Kay [80]3 years ago
3 0
What do you want to calculate?

CALCULATE IT!
Solve
Graph
Lesson

Problem:
Solve
x
+
2
y
=
−
6
;
3
x
+
8
y
=
−
20
Steps:
I will solve your system by substitution.
(You can also solve this system by elimination.)
x
+
2
y
=
−
6
;
3
x
+
8
y
=
−
20
Step: Solve
x
+
2
y
=
−
6
for x:
x
+
2
y
+
−
2
y
=
−
6
+
−
2
y
(Add -2y to both sides)
x
=
−
2
y
−
6
Step: Substitute
−
2
y
−
6
for
x
in
3
x
+
8
y
=
−
20
:
3
x
+
8
y
=
−
20
3
(
−
2
y
−
6
)
+
8
y
=
−
20
2
y
−
18
=
−
20
(Simplify both sides of the equation)
2
y
−
18
+
18
=
−
20
+
18
(Add 18 to both sides)
2
y
=
−
2
2
y
2
=
−
2
2
(Divide both sides by 2)
y
=
−
1
Step: Substitute
−
1
for
y
in
x
=
−
2
y
−
6
:
x
=
−
2
y
−
6
x
=
(
−
2
)
(
−
1
)
−
6
x
=
−
4
(Simplify both sides of the equation)
Answer:
x
=
−
4
and
y
=
−
1
You might be interested in
Rewrite equation in slope intercept form 3x+5y=12
pochemuha

Answer:

y= -3/5x + 12/5

Step-by-step explanation:

6 0
3 years ago
Lisa has a rectangular drawing that is 43.5 centimeters by 934 millimeters. How many centimeters of wood framing will she need?
KIM [24]
Lisa's drawing has the following dimensions:
Width=43.5 cm
Length=934 mm

but 1 cm =10 mm
thus
934mm when converted into cm we shall have:
length=93.4 cm

To get the total length of material required to frame the picture, we calculate the perimeter.
P=2(L+W)
P=2(93.4+43.5) cm
P=2(136.9)
P=273.8 cm

The total length of material required will be 273.8 cm
8 0
3 years ago
The distance between two towns on a map is 9 centimeters. the actual distance between two towns is 63 kilometers. what is the sc
Ilia_Sergeevich [38]
If your trying to find the unit rate or the scale of the map, you need to figure out how many kilometers are per centimeters. To get that you need to do 63 divided by 9, witch would get you 7. So to my ability, the answer would be 1 cm per 7 kilometers. Hopefully this answer helped you and I'm hoping its correct.
5 0
3 years ago
Read 2 more answers
The coordinates of three points in the plane are given below. What is the point of the line through B and C?
Keith_Richards [23]

Step-by-step explanation:

y= x +2

.is the equation of line pass through B, C

3 0
3 years ago
Read 2 more answers
The probability that a new advertising campaign will increase sales is assessed as being 0.80. The probability that the cost of
tatuchka [14]

Answer:

The probability that the cost is kept within budget or the campaign will increase sales is 0.88

Step-by-step explanation:

The probability that the cost is kept within budget (event A) <u>or</u> the campaign will increase sales (event B) is the <u>union</u> of the probability of those two events. By basic properties of probability, this is:

P(A ∪ B) = P(A) + P (B) - P(A ∩ B)

and for independent events:

P(A ∩ B) = P(A) * P(B)

So:

P(A ∪ B) = 0.80 + 0.40 - (0.80*0.40) = 1.20 - 0.32 = 0.88

5 0
3 years ago
Other questions:
  • Simplify the expression where possible. (3b 3) 4
    11·1 answer
  • Can I get some help on these please
    14·2 answers
  • -1/2=y-1<br> solve equation
    7·1 answer
  • What is the answer to this equation: <br> -18 = 9 + 6(y - 4)
    10·2 answers
  • I need help please Math.
    10·1 answer
  • 3214 divided by 5 step by step will give brainliest
    10·2 answers
  • Find the domain of h(x) = 2x - 9 given a range of (-7,5,11)
    13·1 answer
  • Recipe ingredients remain jn a constant ratio no matter how many serving are prepared. Which table shows a possible ratio table
    6·1 answer
  • Nick has a bag of 30 pieces of candy.
    6·1 answer
  • According to a poll, 56% of voters support funding a new community center. A surveyor randomly selects 75 voters and asks each v
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!