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
solong [7]
3 years ago
7

X+2y=7 3x-2y=-3 solving systems by substitution

Mathematics
1 answer:
strojnjashka [21]3 years ago
5 0
Move 2y to the right hand side of the equation by subtracting 2y from both sides.
<span>x=−2y+7</span> 
<span>3x−2y=−3

</span>Replace all occurrences of x<span> with the </span>solution<span> found by solving the last </span>equation<span> for </span><span>x.</span><span> In this case, the value substituted is </span><span><span>−2y+7</span>.
</span><span>x=−2y+7</span> 
<span>3(−2y+7)−2y=−3

</span>Simplify each term<span>.
</span><span>x=−2y+7</span> 
<span>−6y+21−2y=−3

</span>Add <span>−6y</span><span> and </span><span>−2y</span><span> to get </span><span><span>−8y</span>.
</span><span>x=−2y+7</span> 
<span>−8y+21=−3

Move 21 to the right hand side of the equation.
</span><span>x=−2y+7</span> 
<span>−8y=−21−3

</span>Subtract 3<span> from </span><span>−21</span><span> to get </span><span><span>−24</span>.
</span><span><span>x=−2y+7</span> 
<span>−8y=−24

</span></span>Divide<span> each </span>term<span> in the </span>equation<span> by </span><span><span>−8</span>.
</span><span>x=−2y+7</span> 
<span>y=3

</span>Replace all occurrences of y<span> with the </span>solution<span> found by solving the last </span>equation<span> for </span><span>y.</span><span> In this case, the value substituted is </span><span>3.
</span><span>x=−2(3)+7</span> 
<span>y=3

</span>Multiply <span>−2</span><span> by </span>3<span> to get </span><span><span>−6</span>.
</span><span>x=−6+7</span> 
<span>y=<span>3

</span></span>Add <span>−6</span><span> and </span>7<span> to get </span><span>1.
</span><span>x=1</span> 
<span>y=3

</span><span>(1,3)</span>
You might be interested in
How would you graph the result of -3 + 5 as a point on the number line?
almond37 [142]
It would be two places to the right of 0 because -3+5=2
6 0
2 years ago
What is the volume of a sphere with an 18 inch diameter ?
photoshop1234 [79]
18 inch diameter = 9 inch radius
Sphere Volume   = <span>  4/3 • <span>π <span>• r³
</span></span></span><span>Sphere Volume   = <span>  4/3 * PI * 9^3
</span></span><span>Sphere Volume   = <span>  4/3 * PI * 729
</span></span><span><span>Sphere Volume   =   </span>3,053.628 </span>




3 0
3 years ago
Read 2 more answers
Whoever gets it right can have brainliest, but answer ASAP!
stellarik [79]
Answer:
10^3
Step-by-step explanation:
any time you see a number for example 7^6 you always start with those first when you have a math question like the one on the screenshot
5 0
1 year ago
Read 2 more answers
Which equation BEST represents the line of best fit for the scatter plot?
xz_007 [3.2K]
I'm not 100 percent sure I think d
7 0
3 years ago
Read 2 more answers
A historian wonders why an ancient civilization disappeared. He suggests that a natural disaster might have destroyed it thousan
Ray Of Light [21]

Answer:

aaaaaaaaaaaaaaa

Step-by-step explanation:

it A

5 0
3 years ago
Read 2 more answers
Other questions:
  • If someone can help me with this question and get it right I will mark brainliest.
    14·1 answer
  • A(n) _____ is a rectangle with eight selection handles that represents an object's vertical and horizontal dimensions.
    15·1 answer
  • Which of the following represents "Twice the abscissa increased by three times the ordinate is ten"?
    6·1 answer
  • In the lab, Alonzo has two solutions that contain alcohol and is mixing them with each other. Solution A is 6% alcohol and Solut
    14·2 answers
  • Tom determines the system of equations below has two solutions, one of which is located at the vertex of the parabola.
    12·1 answer
  • PLEASE HELP I really need it so please can you help me answer 1-18, please and PLEASE DONT GIVE DUM ANSWERS LIKE Things to know
    9·1 answer
  • DO NOT ANSWER IF YOU ARENT GOING TO HELP
    15·1 answer
  • Solve the equations shown above. Show your work by using the inverse operation.​
    14·2 answers
  • Math<br><br><br> is my answer correct??
    15·1 answer
  • A retailer purchased soccer cleats for $18 from a wholesaler.The retalier sells the cleats for $32.What is the markup rate?Round
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!