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
Kaylis [27]
3 years ago
12

Solving linear system, substitution 20x-30y=-50 x+2y=1 HELP PLEASE

Mathematics
1 answer:
hjlf3 years ago
6 0
20x -  30y = -50 ⇒ 20x -  30y = -50
    x +   2y = -1   ⇒ <u>20x + 40y = -20</u>
                                       <u>-70y</u> = <u>-30</u>
                                        -70     -70
                                            y = ³/₇
                           20x - 30(³/₇) = -50
                             20x - 12⁶/₇ = -50
                             <u>      + 12⁶/₇  + 12⁶/₇
</u>                                        <u>20x</u> = <u>47¹/₇
</u>                                         20<u />       20<u>
</u>                                            x = 2⁷/₂₀
                                      (x, y) = (2⁷/₂₀, ³/₇)
You might be interested in
What are the factors of58
liubo4ka [24]
<span>1,2, 29,and 58 are the factors of 58.</span>
8 0
3 years ago
Find the slope of the line passing through the vertex and the y-intercept of the quadratic function
strojnjashka [21]

Find y intercept

  • y=5(0)²+20(0)-7
  • y=0-7
  • y=-7

Point(0,-7)

Find vertex

x coordinate

  • -b/2a
  • -20/10
  • -2

y coordinate

  • y=5(4)-40-7
  • y=-27

Vertex at (-2,-27)

Slope

  • m=(-27+7)/-2-0
  • m=-20/-2
  • m=10
6 0
1 year ago
Read 2 more answers
7<br> Which is the best estimate for the percent equivalent of 75?<br> 219<br> 229<br> 469<br> 479
Natalka [10]
469 is the perece to equivalent to 75 becuase it’s bigger
3 0
3 years ago
Find the LCM of 20, 35 &amp; 50.
Ivanshal [37]

Answer:

Answer: LCM of 20,35 and 50 is 1400

Step-by-step explanation:

5 0
2 years ago
the nationalities listed in a recent survey (for example, Asian, European, or Hispanic) 19 A) nominal B) interval C) ordinal D)
Ugo [173]

Answer:

A

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Other questions:
  • The graph below shows the number of napkins arranged on different numbers of tables in a room: A graph is shown. The values on t
    11·2 answers
  • Question in Picture<br> vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
    6·1 answer
  • Escreva os numeros racionais na forma de fração: +6,8,-0,375,-0,02 e 0,07
    15·2 answers
  • Help asap thank you!!!
    10·1 answer
  • Someone help me plz hurry <br><br> -51/7
    10·2 answers
  • Please help if you know Math ASAP will mark Brainlest
    8·1 answer
  • 2) 19% of 72 is approximately what?
    5·2 answers
  • Which of the following is a difference of cubes? x^6 + 27y^9 3x^9 - 64y^3 27x^{15} - 9y^3 125x^{21} - 64y^3
    12·2 answers
  • ANSWER CORRECT FOR BRAINLIEST
    10·2 answers
  • Which of the following could be a real-world description of the quantity four times x end quantity divided by 7?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!