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Alisiya [41]
3 years ago
11

X=3y-4 2x-y=7 use substitution method. pls explain :)

Mathematics
2 answers:
Nesterboy [21]3 years ago
4 0

Answer:

the sustitucion metod is easy x=5  y=3

Step-by-step explanation:

x-3y=-4 (-2)

2x-y=7 (1)

-2x+6y=8

2x-y=7

5y=15

y=3

2x-3=7

2x=10

x=5

Y_Kistochka [10]3 years ago
4 0

Step-by-step explanation:

x=3y-4 eqn i

2x-y =7 eqn ii

2x - 7 = y

sub y=2x-7 in eqn i

x=3(2x-7)-4

x=6x-21 -4collecting like terms

x-6x= -21-4

-5x= -25

divide both sides by 5

x=5

since x=5 sub in any eqn

y=2x-7

=2(5) -7

y=10 -7=3

You might be interested in
-3(7w-3)+8w=-5(w+1) what is the value of w
bogdanovich [222]

Answer:

2

Step-by-step explanation:

Step 1:

- 21w + 9 + 8w = - 5w - 5

Step 2:

- 13w + 9 = - 5w - 5

Step 3:

- 7w + 9 = - 5

Step 4:

- 7w = - 14

Step 5:

14 = 7w

Answer:

w = 2

Hope This Helps :)

6 0
3 years ago
1/1×3+1/2×4+1/3×5 +...+1/18×20=<br><br>Please, help me. ❣️​
Sedaia [141]

Answer:3.1944

Step-by-step explanation:

(1÷1×3)+1÷(2×4)+1÷(3×5)+1÷(18×20)

6 0
3 years ago
How many different triangles can you make with 14cm, 10cm and 50cm sides?
vovangra [49]

Answer:

You can make NO triangles.

When given 3 sides of a triangle, The longest side must be LESS than the sum of the other 2 sides.

Longest Side = 50 cm

50 is NOT less than 14 + 10, therefore, we have no triangle.


Step-by-step explanation:


8 0
3 years ago
Hello there can anyone solve this plz (chart is attached):
stich3 [128]

Answer:

h^\prime(1)=14

Step-by-step explanation:

We have the function:

h(x)=f[f(x)]

And we want to find:

h^\prime(1)

So, we will differentiate function <em>h</em>. By the chain rule, this yields:

h^\prime(x)=f^\prime[f(x)]\cdot f^\prime(x)

Then it follows that:

h^\prime(1)=f^\prime[f(1)]\cdot f^\prime(1)

Using the table, we acquire:

h^\prime(1)=f^\prime(3)\cdot2

And using the table again, we acquire:

h^\prime(1)=7\cdot 2

Evaluate. Hence:

h^\prime(1)=14

6 0
3 years ago
BRAINLY!! PLEASE HELP ME!! IF YOUR GOOD AT MATH!!
riadik2000 [5.3K]

A. Here's a fifth degree polynomial,

f(x) = x⁵ + 4x⁴ - 14x² + 9

It's in standard form, each term a constant coefficient times a whole number power of x (including the constant, which we can think of as the coefficient on x⁰=1), with the terms sorted from highest degree (highest power on x) to lowest.

B.  The closure of addition wrt polynomials just means when we add two polynomials we get another polynomial.

f(x) = x⁵ + 4x⁴ - 14x² + 9

g(x) = -2x⁴  + x

f(x)+g(x) = x⁵ + 2x⁴ - 14x² + x + 9

We added two polynomials, we got another one, that's all closure is.

5 0
3 years ago
Read 2 more answers
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