3 years ago

How are the slopes of parallel lines and perpendicular lines related?

1 answer:

7 0

1. Slope are parallel lines are equal (the same)
y=2x+5, y=2x+7
2. Slope are perpendicular lines are negative reciprocal
Example, y=2x+5, y=-1/2 x + 7

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Monica [59]

Answer:

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3 years ago

Read 2 more answers

Multiply the matrices. (Please help!)

Ainat [17]

9514 1404 393

Answer:

$\left[\begin{array}{cc}12&1\\-4&1\\-11&28\end{array}\right]$

Step-by-step explanation:

The element at row i column j in the product is the dot-product of row i of the first matrix and column j of the second matrix. For example, row 2 column 1 of the product is ...

(row 2) · (column 1)

[3, -2, 4] · [2, 7, 1] = (3)(2) +(-2)(7) +(4)(1) = 6 -14 +4 = -4

The attachment shows the complete product matrix. It is convenient to let a spreadsheet or graphing calculator do the tedious repetitive arithmetic.