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
8_murik_8 [283]
3 years ago
6

-2x-y=-9 5x-2y=18 substitution

Mathematics
2 answers:
KIM [24]3 years ago
6 0
-2x-y=-9 \\
5x-2y=18 \\ \\
\hbox{solve the first equation for y:} \\
-2x-y=-9 \ \ \ |+2x \\
-y=-9+2x \ \ \ |\times (-1) \\
y=9-2x \\ \\
\hbox{substitute 9-2x for y in the second equation:} \\
5x-2(9-2x)=18 \\
5x-18+4x=18 \\
9x-18=18 \ \ \ |\div 9 \\
x-2=2 \ \ \ |+2 \\
x=4 \\ \\
y=9-2x=9-2 \times 4=9-8=1 \\ \\
\boxed{(x,y)=(4,1)}
Inessa05 [86]3 years ago
4 0
-2x-y = -9 5x-2y=18 -solve for y in terms of x -y= 2x-9 y=-2x+9 substitute 5x-2 ( -2x+9)=18 5x+4x -18=18 9x-18=18 9x= 36 x=4 substitute for x -2 (4) -y= -9 -8 -y = -9 -y = -1 y= 1 ANSWER x= 4 y=1 hope this helps
You might be interested in
1658.013 to the nearest hundred
tiny-mole [99]
The answer would be 1700.000
4 0
3 years ago
Read 2 more answers
Pls help......
lora16 [44]
If the two equations in parenthesizes were there own equations which ones would equal 1 and 6
(x-1) or x=1
(3x-1) or x=1/3
3(x-1) or 3x-3 or x=1
Do you understand?
5 0
3 years ago
Read 2 more answers
A circle is centered at the point (-7, -1) and passes through the point (8, 7).
Nookie1986 [14]
Radius is the distance from the centre to any point in the circumference. i.e. radius = \sqrt{ (-7-8)^{2} + (-1-7)^{2} } = \sqrt{ (-15)^{2} + (-8)^{2} } \\ = \sqrt{225+64} = \sqrt{289} =17
radius = 17 units
4 0
3 years ago
Read 2 more answers
The regression equation y=0.5x+1.3 approximates the number of hours it takes to arrange a dinner event, y, given the number of p
Sphinxa [80]

It would be C.

For example, say 1 person comes. This would be x=1. Plugging this in gives you,

y=0.5 + 1.3

This shows that C is true since x is always going to be multiplied by 0.5.

1.3 would be the base amount of time it takes to arrange since if it the y-intercept.


5 0
3 years ago
What is the answer to 90+8
lord [1]

Answer:

98 hope it helps yesssssss

4 0
2 years ago
Read 2 more answers
Other questions:
  • What is 3/4 divided by 4/3¿
    8·2 answers
  • Keshawn is constructing the inscribed circle for △PQR . He has already used his compass and straightedge to complete the part of
    6·2 answers
  • Give to 2 solution of the inequality k< 2
    13·2 answers
  • A company loses $780 as a result of shipping delay. The 6 owners of the company must share the loss equally. Write an expression
    7·1 answer
  • if the difference in the side lengths of two squares is 10, and the sum of the side lengths is 18, what are the side lengths?
    10·1 answer
  • Find three consecutive whose sum 237
    13·2 answers
  • I also need help with this one too
    13·2 answers
  • Here is the Triangle <br><br> What is the measure of angle A?
    8·1 answer
  • Is The boundary line for the inequality y &lt; -7/3x - 3 is a solid line.
    10·1 answer
  • 2( 4x + 1 ) = 3x - 6x
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!