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
Lana71 [14]
3 years ago
8

Hi,please help me.with this question im.confuse. please help me with question 1c

Mathematics
2 answers:
olga nikolaevna [1]3 years ago
4 0
1c. 3x - 2y = 6
x = 5 - 2y

What they mean by substitution is that you need to put that x that they gave you into the x of the first equation to get y.

Right now it looks like this:
3x - 2y = 6

Now you have to put (5 - 2y) into the x of the equation.

3(5 - 2y) - 2y = 6

Now solve.
First distribute the 3.

15 - 6y - 2y = 6

Combine like terms.

15 - 8y = 6

Get rid of the 15 by subtracting it from both sides.

-8y = -9

Divide both sides by -8.

y = 1.125

Now put the y into the second equation.

x = 5 - 2(1.125)
x = 5 - 2.25
x = 2.75


x = 2.75
y = 1.125
Lynna [10]3 years ago
3 0

3x-2y=6

x=5-2y

 replace x in the 1st equation with x in the 2nd one so you get:

3(5-2y)-2y=6

15-6y-2y=6

15-8y=6

-8y=-9

y=1.125

x=5-2(1.125) = 5-(2.25)=2.75

check: 3(2.75)=8.25, 2(1.125)=2.25, 8.25-2.25 = 6

y = 1.125

x = 2.75




You might be interested in
Suppose you are climbing a hill whose shape is given by the equation z = 1400 − 0.005x2 − 0.01y2, where x, y, and z are measured
Anarel [89]
Answer: You start to ascend

Explanation:

Since you are walking due south and the positive y-axis points north, the y-coordinate decreases.

Let 

y' = y-coordinate after walking due south
z' = z-coordinate (or the height) after walking due south

So, the point where you stand after walking due south has a coordinate of (100, y', z'). Moreover,

z' = 1,400 - 0.05(100)^2 - 0.01(y')^2
\\ \boxed{z' = 1350 - 0.01(y')^2}

Since the y-coordinate decreases after walking due south and z' = 1350 - 0.01(y')^2,

y'  \leq 120\\ \Rightarrow (y')^2 \leq 120^2 = 14,400\\ \Rightarrow -0.01(y')^2 \geq -0.01(14,400) = -144\\ \Rightarrow z' = 1,350 - 0.01(y')^2 \geq 1,350 - 0.01(14,400) = 1,206\\ \Rightarrow \boxed{z' \geq 1,206}

So, the height after walking due south exceeds 1,206 meters, which is the previous height before walking due south. Therefore, if you walk due south from point with coordinates (100, 120, 1206), you are ascending.
5 0
3 years ago
PLEASE HELP! thanks need done asap like oof im tired lol
ohaa [14]

Answer:

first ones 11

Step-by-step explanation:

-22/-2=11

7 0
3 years ago
Read 2 more answers
Calculate the Rate of Return on an initial investment of $6,000 valued at $6,500.
bezimeni [28]

Answer:

8.3%

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
I NEED SOME HELP PLEASE
slega [8]
Exact answer is 90pi and volume is 283
8 0
3 years ago
How to prove two equations have infinite solutions?
laiz [17]
To prove two equations have infinite solutions, you have to prove that those two equations are the same equations, but in a different form.

For example: Prove the equations are infinite
5y=2x+7
10y=4x+14
If you multiply the first equation by 2, and substitiute any of the numbers, you will get 0=0
6 0
3 years ago
Other questions:
  • I don’t know how to solve the equation
    11·1 answer
  • Two angles in a triangle add up to 108 degrees what is the size of the third angle
    8·1 answer
  • If f(x)=2x^2+1, what is f(x) when x =3 <br>A)1<br>B)7<br>C)13<br>D)19​
    13·1 answer
  • Please help. i will give brainliest. please just give it a try ur geuss is as good as mine
    10·2 answers
  • What is <br> (-49/7) + (-64/8)=
    12·1 answer
  • a bell rings every 2 hours, a second bell rings every 3 hours, and a third bell rings every 4 hours. if all 3 bells rind at 9:00
    6·2 answers
  • Find the slope of regular AB, and make sure you reduce the fraction to simpelist form 
    10·1 answer
  • Members of a park-walking club were asked how often do they visit a gym or other exercise facility outside their home. The follo
    10·1 answer
  • Mrs. Harris treated her 1st period with donuts for averaging the highest on the midterm exam. She bought 25 donuts, By the end o
    8·1 answer
  • Rita owed her brother $15 after her birthday she was able to pay him back and still had $45 how much money did Rita receive for
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!