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Rainbow [258]
2 years ago
13

Solve above question​

Mathematics
2 answers:
Mandarinka [93]2 years ago
7 0
Y=2−3x

2 Substitute
y
=
2
−
3
x
y=2−3x into
x
+
y
=
7
x+y=7.
−
2
x
+
2
=
7
−2x+2=7

3 Solve for
x
x in
−
2
x
+
2
=
7
−2x+2=7.
x
=
−
5
2
x=−
2
5
​


4 Substitute
x
=
−
5
2
x=−
2
5
​
into
y
=
2
−
3
x
y=2−3x.
y
=
19
2
y=
2
19
​


5 Therefore,
x
=
−
5
2
y
=
19
2

​

x=−
2
5
​

y=
2
19
​

​

melisa1 [442]2 years ago
5 0

Answer:

x=-2.5,y=7.5

Step-by-step explanation:

Solution,

3x+y=2.....(1)

x+y=7

or,y=7-x......(2)

Now,by putting the value of y from equation 2 to equation 1,we get

3x+y=2

or,3x+(7-x)=2

or,3x+7-x=2

or,2x+7=2

or,2x=2-7

or,2x=-5

or,x=-5/3

or,x=-2.5

Again,

by putting the value of x in equation 2,we get

x+y=7

or,-2.5+y=7

or,y=7+2.5

or,y=7.5

<em>I </em><em>HOPE</em><em> THIS</em><em> WILL</em><em> HELP</em><em> U</em>

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Read 2 more answers
Find the product of the following polynomials:
qaws [65]

Answer:

A)  -84x^3 - 8x

B)  -91x^4 + 143x^2 - 65x

C)  12b^2 - 7b - 10.

D)  16x^2 - 72x + 81

Step-by-step explanation:

A) -4x(21x^2-3x+2)  

B) -13x(7x^3-11x+5)

C) (3b+2)(4b-5)

D) (4x-9)^2

In A) -4x(21x^2-3x+2)  we are multiplying the binomial (21x^2-3x+2)  by the monomial -4x; there are two multiplications involved:  

-4x(21x^2) = -84x^3

and

-4x(-3x+2) = +12x^2 - 8x.

Hence A) -4x(21x^2-3x+2)   = -84x^3 - 8x

B)  The work done to find the product in B) is similar:  Multiply each term in 7x^3-11x+5 by -13x:

The end result is -91x^4 + 143x^2 - 65x

C) Here we are multiplying together two binomials; we use the FOIL method:  Multiply together the First terms, then the Outer terms, then the Inner terms, and finally the Last terms.  This results in:

(3b+2)(4b-5)  = 12b^2 -15b + 8b -10, or, after simplification, 12b^2 - 7b - 10.

In D) we are squaring a binomial.  The formula for this is:

(a - b)^2 = a^2 - 2ab + b^2.  Here,

(4x - 9)^2 = 16x^2 - 2(36x) + 81, or 16x^2 - 72x + 81

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3 years ago
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