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3 years ago

A) Why are all parallelograms not rectangles?

1 answer:

8 0

a) Rectangles always have 4 right angles (90 degrees), but parallelograms do not always have 4 right angles rather they can, but do not have to. Rectangles have to.

b) A square is a type of rectangle, but a rectangle is not a type of square. Both rectangles & squares have 4 right angles and are always quadrilaterals, but squares always have all sides that have the same length, but rectangles do not have to have their sides all equivalent lengths.

c) In the case of a parallelogram, the opposite sides are equal whereas in a rhombus all four sides are equal.

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How to find slope of line??? please help!!!

Hatshy [7]

Answer: -1

Step-by-step explanation:

Find the two coordinates first.

In this case, they are (-4, 1) and (-2, -1).

Use the following formula to calculate slope:

$\frac{y2-y1}{x2-x1}$

Substitute in the coordinates:

$\frac{1-(-1)}{-4-(-2)}$ = $\frac{2}{-2}$ = -1

7 0

3 years ago

A student solved a system of equations by elimination. Describe and correct the error made in the part of the solution shown.

ivanzaharov [21]

Answer:

x = -2; y = 3

Step-by-step explanation:

5x + 4y = 2 (1)

3x + 3y = 3 (2)

Multiply (1) by 3 and (2) by 4

15x + 12y = 6 (3)

12x + 12y = 12 (4)

Subtract (4) from (3)

15x - 12x = 6 - 12

3x = -6

x = -6/3

x = -2

Substitute x = -2 into (1)

5x + 4y = 2

5(-2) + 4y = 2

-10 + 4y = 2

4y = 2 +10

4y = 12

y = 12/4

y = 3

The first error is when he multiplied equation (2) by 4

He didn't multiply the right hand side of the equation by 4

3x + 3y = 3 ×4

12x + 12y = 12

But he wrote

12x + 12y = 3

The the next error is subtracting the left hand side of the equation and adding the right hand side

15x + 12y = 6

12x + 12y = 3

He wrote

3x = 9

Instead of 3x = 3

7 0

3 years ago

1. 5(x−7)5(x−7) 2. −9(p−3)−9(p−3) 3. 3(4x+3y)3(4x+3y) 4. −10(5p+7)−10(5p+7)

inn [45]

Answer:

Step-by-step explanation:

because it is right unlike the other ones

4 0

2 years ago

Solve the system of linear equations by elimination -x+y=4;x+3y=4

mamaluj [8]

Answer:

the solution is (-8, 4)

Step-by-step explanation:

Let's use the addition/subtraction method here to eliminate one variable:

-x+y=4

x+3y=4

Combining these two equations results in

4y = 8, so that y = 2. Substituting y = 2 into the second equation, we get:

x + 3(2) = 4, or x = -2.

Then the solution is (-8, 4)

3 0

3 years ago

What is the equation of the line in slope-intercept form? plz help 20 points

AfilCa [17]

To find slope intercept form first do rise over run

rise 4 run 3

then find where it crosses the x-intercept to get

y=4/3x-3

5 0

4 years ago