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serg [7]
4 years ago
14

What is the value of the x variable in the solution to the following system of equations?

Mathematics
1 answer:
satela [25.4K]4 years ago
4 0
Let's use the addition/subtraction method.

Suppose we wish to eliminate variable x.

Mult the first eqn by 5:  10x - 15y = 15
Mult the 2nd eqn by -2: -10x+ 4y  = -8

Add these two equations together:  -11y = 7, and y = -7/11.

Subst. -7/11 for y in either given equation and find x.

Then your solution is (x,y)   (subst. the values we've found for x and y).

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Need help answer it in the bottom
gladu [14]

Answer:

it depend

Step-by-step explanation:

i can edit this answer but-

do they mean that both objects together costs that much or does that mean that pens and pencils cost the same?

8 0
3 years ago
Use the functions f(x)=7x3−3x2−x+14 f x = 7 x 3 - 3 x 2 - x + 14 and g(x)=2x3+2x+5 g x = 2 x 3 + 2 x + 5 as examples to show tha
Aneli [31]

Answer:

<h3>The given set of polynomials f(x) and g(x) are closed under subtraction.</h3>

Step-by-step explanation:

Given that the functions f ad g are defined by

f(x)=7x^3-3x^2-x+14 and g(x)=2x^3+2x+5 respectively.

<h3>To  show that the set of polynomials is closed under subtraction :</h3>

Now subtract the given polynomials

f(x)-g(x)=(f-g)(x)

=7x^3-3x^2-x+14-(2x^3+2x+5)

=7x^3-3x^2-x+14-2x^3-2x-5

=5x^3-3x^2-3x+9

∴ f(x)-g(x)=5x^3-3x^2-3x+9

  • When subtracting the polynomials the variables and their exponents remains same only variation in their coefficients.
<h3>Hence the given polynomials f(x) and g(x) are closed under subtraction.</h3>

∴ f(x)-g(x)=5x^3-3x^2-3x+9 are closed under subtraction,

Hence showed.

3 0
3 years ago
How many solutions can have two intersecting lines have?<br> A. 3<br> B. 0 <br> C. 1
Vladimir [108]

two intersecting lines can only have 1 solution.

4 0
3 years ago
Read 2 more answers
Given the slope of the line containing the points (7 , b) and (-2 , 5) is 4/9, find the value of b​
MAVERICK [17]

Answer: b=9

Step-by-step explanation: To find the slope we use: y2-y1/x2-x1

Which would then be: 5-b/-2-7= 5-b/-9

Then we have to find a number for b that would give us -4 as the numerator. That number would be 9

This would give us 4/9 which is the slope we already had.

6 0
3 years ago
Which symbol can be used to correctly compare the two fractions?
aev [14]

Answer:

>

Step-by-step explanation:

Divide them, Do 2 divided by 5 and you'll get 0.4 and then do 35 divided by 100 and you'll get 0.35. 0.4 is bigger then 0.35 so the answer will be >.

4 0
2 years ago
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