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il63 [147K]
3 years ago
11

4x - 7y = 3 x - 7y = 15

Mathematics
1 answer:
charle [14.2K]3 years ago
5 0
\left \{ {{4x-7y=3} \atop {x-7y=15}} \right. \\\\
 \left \{ {{4x-7y=3} \atop {x=15+7y}} \right. \\\\ substitution\ method\\\\
4*(15+7y)-7y=3\\\\
60+28y-7y=3\\\\
60+21y=3\ \ \ \ | subtract\ \\\\
21y=-57\\\\
y=-\frac{57}{21}=-\frac{19}{7}\\\\
x=15+7*(-\frac{19}{7})=15-19=-4\\\\\ Solution :\  \left \{ {{y=-\frac{19}{7}} \atop {x=-4}} \right.
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3 years ago
Given that MN = 5, NO = 12, and MO = 13, find cos O.
Galina-37 [17]

Answer:

12/13

Step-by-step explanation:

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8 0
3 years ago
Which of the following binomials is a factor of 22 + 7 −9 ?
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3 years ago
2 − 4 x 6 Select the expression that represents the following statement: multiply the difference of 5 and 2 by 7, and then add 6
otez555 [7]

Hey there!

2 - 4 * 6

= 2 - 24

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Option A.
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= 7 * 3 + 6

= 21 + 6

= 27

Option A. is incorrect


Option B.
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= 5 + 14 + 6

= 19 + 6

= 25

Option B. is also incorrect


Option C.
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= 7 * 7 - 6

= 49 - 6

= 43

Option C. is also incorrect


Option D.

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= 39

Thus, it seems like NONE of the ABOVE is correct


Good luck on your assignment & enjoy your day!


~Amphitrite1040:)

7 0
2 years ago
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