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Anna11 [10]
3 years ago
8

1. Use algebraic identities to evaluate each of the followings

Mathematics
1 answer:
Eva8 [605]3 years ago
6 0
Hey i need this answer too. please like this when you get the answer. thanks ;)
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Y is inversely proportional to x.
Inessa [10]

Answer:

1. xy = 63

2. y = 3

Step-by-step explanation:

Given

Variation: inverse Proportion

y = 7, x = 9

Required

- Write an equation connecting y and x

- Find y when x = 21

Given that thee variation is inversely proportional;

This implies that

y\ \alpha\ \frac{1}{x}

Convert variation to equation

y\ = \frac{k}{x} ----------- Equation 1

Where k is the constant of variation

Substitute 7 for y and 9 for x in equation 1

7 = \frac{k}{9}

Multiply both sides by 9

9 * 7 = 9 * \frac{k}{9}

63 = k

Substitute 63 for k in equation 1

y = \frac{63}{x}

Multiply both sides by x

x * y = \frac{63}{x} * x

xy = 63

Hence, the equation connecting x and y is xy = 63

Solving for when x = 21

Substitute 21 for x in the above equation

21 * y = 63

Divide both sides by 21

\frac{21 * y}{21} = \frac{63}{21}

y = 3

4 0
3 years ago
Graph the point (5, 0) on the coordinate plane.
gavmur [86]

Answer:

it just be positive 5

Step-by-step explanation:

3 0
3 years ago
Which pair of numbers are equivalent? 0.65% and 65100.65% and 65 tenths 0.7 and 7% 0.7 and 7% 0.5 and 150.5 and 1 fifth 0.02 and
N76 [4]

Step-by-step explanation:

ekfdjisksox9xjfnskosidbd

6 0
3 years ago
Can someone help me with this?
Gre4nikov [31]
D

Hope this helps!!!!!
7 0
3 years ago
Read 2 more answers
2/3*x+3/4=8 what is x
matrenka [14]

Answer: x=10 7/8

Step-by-step explanation:

Subtract 3/4 from both sides. Multiply both sides by 3. Divide both sides by 2 (basically just isolate x on one side of the equal sign).

7 0
3 years ago
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