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IceJOKER [234]
3 years ago
9

How do you decide whether substitution is the best method to solve a system in three variables?

Mathematics
1 answer:
Ivan3 years ago
3 0
<span>Select one equation and solve it for one of its variables.
In the other equation, substitute for the variable just solved.
Solve the new equation. 
<span>Substitute the value found into any equation involving both variables and solve for the other variable. </span></span>
You might be interested in
Which equation gives the number of half inches that are in 7/8 inch?
svetoff [14.1K]

7/8 divided by 1/2

copy dot flip

7/8 * 2/1

14/8

divide by 2 on top and bottom

7/4


7/8 ÷ 1/2 = 7/4

Choice A


3 0
3 years ago
The greatest common factor of three numbers is 9. The sum of the numbers is 90. Find the three numbers.
Ivan

Answer:

2, 3, 5

Step-by-step explanation:

9 x 2= 18

9 x 3 = 27

9 x 5 = 45

4 0
3 years ago
Can’t figure it out
Lubov Fominskaja [6]

Answer:

b

Step-by-step explanation:

6 0
3 years ago
A golfer hits a ball from a starting elevation of 2 feet with a velocity of 70 feet per second down to a green with an elevation
ikadub [295]

Answer:

4.50 s

Step-by-step explanation:

The motion of the ball is represented by the following equation:

h(t) = 2+70t-16t^2 (1)

where

h(t) is the elevation at time t

2 ft is the initial elevation at t = 0

+70 ft/s is the initial vertical velocity

-32 ft/s^2 is the acceleration due to gravity

The green is located at an elevation of -7 feet, so the ball lands on the green when

h(t) = -7

Substituting into (1)

-7=2+70t-16t^2

And re-arranging we get

16t^2-70t-9=0

This is a second-order equation in the form

at^2+bt+c=0

which has solutions

t_{1,2}=\frac{-b\pm \sqrt{b^2-4ac}}{2a} (2)

Here we have:

a = 16

b = -70

c = -9

Substituting into (2) we find the solutions:

t_{1,2}=\frac{70\pm \sqrt{(-70)^2-4(16)(-9)}}{2(16)}

The two solutions are:

t = 4.50 s

t = -0.125 s

The second solution is negative, and since negative time has no physical meaning, the only correct solution is

t = 4.50 s

5 0
3 years ago
What is the answer is of it tell me fast
s344n2d4d5 [400]

Answer :

<u>Given</u><u> </u><u>-</u>

  • Books read by aya = 5
  • Total number of books read by them = 14

<u>To</u><u> </u><u>find</u><u> </u><u>-</u>

  • How many books does luka reads.

<u>Solution</u><u> </u><u>-</u>

Here, total number of books is 14 and books read ny aya is 5 . To find the luka reads We'll subtract total number of books read by them from books read by aya.

→ 14 - 5

→ 9

<u>There</u><u>fore</u><u>,</u><u> </u><u>9</u><u> </u><u>books</u><u> </u><u>read</u><u> </u><u>by</u><u> </u><u>luka</u><u>.</u><u> </u>

7 0
3 years ago
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