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german
3 years ago
8

Solve the following system by elimination. Show work and explain each step.

Mathematics
1 answer:
Dovator [93]3 years ago
4 0

Answer:

The solution of the system of linear equation provided is (4, 1).

Step-by-step explanation:

A system of linear equation can be solved using the elimination method. In this method we either add or subtract the two equations to eliminate one of the variables.

If addition or subtraction cannot be applied directly then multiply one or both the equation with a constant such that the coefficient of one of the variables becomes equal for both the equations.

The equations provided are:

3x+y=13....(i)\\4x-3y=13....(ii)

Addition or subtraction cannot be applied directly to eliminate any of the two variables.

Multiply equation (i) by 3,

3(3x+y)=3*13\\9x+3y=39....(iii)

Add equations (ii) and (iii),

 4x-3y=13\\+9x+3y=39

Solving by eliminating the variable y,

13x=52\\x=\frac{52}{13} \\=4

The value of variable x is 4.

Now substitute the value of x=4 in equation (i) and solve for y,

3x+y=13\\(3*4)+y=13\\12+y=13\\y=1

Thus, the solution of the system of linear equation provided is (4, 1).

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See explanation

Step-by-step explanation:

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slega [8]
Check the picture below.

the radius, so-called because if we circumscribe the triangle in a circle, that'd be the radius of the circumcircle, is 3 inches, as you see there in the picture in red.

now, bear in mind that the triangle is an equilateral one, and therefore, 180/3 = 60, meaning all its interior angles are congruently 60°.

if we run the radius of the triangle, like there, it will cut one of those interior angles in half, namely the radius is an angle bisector, and if we run a perpendicular line to the bottom side, like the dashed one there, we end up with a 30-60-90 triangle, to which we can apply the 30-60-90 rule, as you see it there.

since we know what half of a side of the triangle is, as you see it there in blue, then we can use that and plug it in at

\bf \textit{area of an equilateral triangle}\\\\
A=\cfrac{s^2\sqrt{3}}{4}~~
\begin{cases}
s=length~of\\
\qquad a~side\\
-------\\
s=\stackrel{\frac{3\sqrt{3}}{2}+\frac{3\sqrt{3}}{2}}{3\sqrt{3}}
\end{cases}\implies A=\cfrac{(3\sqrt{3})^2\sqrt{3}}{4}
\\\\\\
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Step-by-step explanation:

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