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exis [7]
3 years ago
8

Solve for the following system of equations. -7x+6y=9 -2x-5y+16 x=? y=?

Mathematics
2 answers:
CaHeK987 [17]3 years ago
4 0

Answer:

x=-3\\\\y=-2

Step-by-step explanation:

Given the system of equations \left \{ {{-7x+6y=9} \atop {-2x-5y=16}} \right., you can use the Elimination Method to solve it.

You can multiply the first equation by -2 and the second equation by 7, then add both equations and solve for the variable "y":

\left \{ {{14x-12y=-18} \atop {-14x-35y=112}} \right.\\...........................\\-47y=94\\\\y=\frac{94}{-47}\\\\y=-2

Substitute the value of "y" into any original equations and solve for the variable "x". Then:

-7x+6y=9\\\\-7x+6(-2)=9\\\\-7x-12=9\\\\-7x=9+12\\\\x=\frac{21}{-7}\\\\x=-3

Alex17521 [72]3 years ago
3 0

Answer:

x = -3 and y = -2

Step-by-step explanation:

It is given that,

-7x + 6y = 9     ----(1)

-2x - 5y = 16    -------(2)

<u>To find the solution of given equations</u>

eq(1) * 2 ⇒

-14x + 12y = 18 ------(3)

eq(2) * 7 ⇒

-14x - 35y = 112   ---(4)

eq (3) - eq(4) ⇒

-14x + 12y = 18 ------(3)

<u>-14x - 35y = 112 </u>  ---(4)

    0   4y = -94

y = 94/(-47) = -2

Substitute the value of y in eq (2)

-2x - 5y = 16    -------(2)

-2x - 5*-2 = 16

-2x +10 = 16

-2x = 6

x = 6/-2 = -3

Therefore x = -3 and y = -2

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Answer:

a). Mileage for carA= \frac{2}{x}  , and mileage for carB=\frac{ 3x+2}{x(x+1)}

b).total mileage for both is similar to average of them= \frac{(mileageA + mileageB)}{2}

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Step-by-step explanation:

It is given that the distance traveled by car A=2x+2=2(x+1)

And distance traveled by car B= 3x+2

We know the mileage is mile/gallon,

a).So mileage of car A= \frac{distance traveled by car A}{gallos of fuel used}

=\frac{2x+2}{x^2 +x}\\ =\frac{2(x+1)}{x(x+1)} \\=\frac{2}{x}mil/gal

Similarly , the mileage for car B= \frac{distance traveled by car A}{gallons of fuel used}

=\frac{3x+2}{x^2+x} \\=\frac{3x+2}{x(x+1)}mil/gal

b).total mileage for both is similar to average of them= \frac{(mileageA + mileageB)}{2}

=\frac{2x+2}{x(x+1)}+\frac{3x+2}{x(x+1)}\\ =\frac{2x+2+3x+2}{x(x+1)}\\=\frac{5x+4}{x(x+1)}mil/gal

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4 0
3 years ago
​A gardener has 1000 plants. He wants to plant these in such a way that the number of rows and
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Step-by-step explanation:

1000 is not a perfect square.

31^2  < 1000 < 32^2

 

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3 0
3 years ago
Solve the equation for x. 2 3 x −1 9 x + 5 = 20 x =
zubka84 [21]

Answer:

5/2

Step-by-step explanation:

23x-19x+5=2x

23x-19x-2x=5

2x/2=5/2

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3 0
3 years ago
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PLZZZZ ANSWER QUICK!!!! A line passes through the points (–1, –5) and (4, 5). The point (a, 1) is also on the line. What is the
Svetradugi [14.3K]
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3 years ago
What polynomails has the roots of -6, -4 ,and 1? A)x³-9x²-22x+24 B) x³-x²-26x-24 C) x³+x²-26x+24 D)x³+9x²+14x-24.
never [62]

Answer:

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Step-by-step explanation:

Solve for x over the real numbers:

x^3 + 9 x^2 + 14 x - 24 = 0

The left hand side factors into a product with three terms:

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Split into three equations:

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Add 1 to both sides:

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Subtract 4 from both sides:

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Subtract 6 from both sides:

Answer:  x = 1 or x = -4 or x = -6

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3 years ago
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