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Natalija [7]
3 years ago
14

Use properties of multiplication to show why 4 x 50 = 8 x 25.

Mathematics
1 answer:
nikdorinn [45]3 years ago
5 0

Given:

4\times 50 =8\times 25

To find:

The steps to prove the given statement by using the properties of multiplication.

Solution:

We have,

4\times 50 =8\times 25

Taking left hand side, we get

LHS=4\times 50

LHS=4\times (2\times 25)

LHS=(4\times 2)\times 25     (Associative property of multiplication)

LHS=8\times 25

LHS=RHS

Hence proved.

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How many solutions does the system have? y=−2x+4
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Answer:

There is only one solution and the solution is (0,4).

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The given system has equations;

y=-2x+4

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x^2-2x+4=-2x+4

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Write an equation for the perpendicular bisector of the line segment joining the two points.
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Points (1, 7)  and  (-3, 2)

Slope for a line between (x₁, y₁) and (x₂, y₂) , m = (y₂ -y₁) / (x₂- x₁)

The slope for the line joining the two points =  (2 - 7) / (-3 - 1) = -5/-4

Slope = 5/4

Hence the perpendicular bisector would have a slope of -1/(5/4) = -4/5

By condition of perpendicularity

For points (1, 7)  and  (-3, 2),

Formula for midpoints for (x₁, y₁) and (x₂, y₂) is ((x₁ +x₂)/2 , (y₁+ y₂)/2)

Midpoint for (1, 7)  and  (-3, 2) = ((1+ -3)/2 , (7+2)/2) = (-2/2, 9/2)

= (-1, 9/2)

Since the slope of perpendicular bisector is -4/5 and passes through the midpoint (-1, 9/2)

Equation  y - y₁ = m (x - x₁)

                y - 9/2 = (-4/5) (x - -1)
           
                y - 9/2 = (-4/5)(x + 1)

               5(y - 9/2) = -4(x + 1)

               5y - 45/2 = -4x - 4

                 5y =  -4x - 4 + 45/2
           
                5y + 4x = 45/2 - 4

                  5y + 4x = 22  1/2  - 4 =  18 1/2

                  5y + 4x =  37/2

                  10y + 8x = 37

The equation of the line to perpendicular bisector is 10y + 8x = 37
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4 years ago
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