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zysi [14]
3 years ago
9

Determine whether the graphs of the two equations are perpendicular x-7y=4 and 21x+3y=11

Mathematics
1 answer:
Sveta_85 [38]3 years ago
3 0

Step-by-step explanation:

when multiplied together, the gradients of the 2 graphs should equal -1 (of they are perpendicular).

x-7y=4

-7y= -x + 4

y= -1/7 x + 4/7

21x+ 3y=11

3y=-21x+11

y=-21/3 x + 11/3

-21/3 * -1/7 = 1

when multipled together, the 2 gradients dont equal -1 therefore they are not perpendicular

unless I've made a mistake with the signs at some point haha

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Carlie’s Cell Phone Store has a gross income of $1,287,684 and deductions of $598,982. What is the federal corporate income tax?
slava [35]
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3 years ago
Please help and explain. Thx a bunch
musickatia [10]
I don't know if i'm right but i think its A cuase it has a comma after each place like it should be 
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Read 2 more answers
The sum of the 13th square number and the 4th cube number?
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Answer:

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4 0
3 years ago
Which of the following is the equation of a line that passed though the points (2,5) and (4,3)
STatiana [176]

The correct answer is C as it has the same line of equation. We can make this clear by verifying that these two points make the same equation or not. So as we can see if we calculate the gradient using the formula y2 - y1 / x2 - x1.

As we now know that the gradient is -1. We can simply put any one point in the equation y - y1 = m(x - x1) to get the line of equation. WHen we calculate the line of equation it come out to be y = -x + 7

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