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riadik2000 [5.3K]
3 years ago
15

Perimeter of a rectangle HELP!

Mathematics
1 answer:
alexdok [17]3 years ago
3 0
All I can say is that your equation is wrong
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A line passes through A(3,7) and B(-4,9) find the value of a if C (a 1) is on the line
Xelga [282]
What we need to do first, is to write the equation of the line through points A and B. 


the slope of the line through A(3, 7) and B(-4, 9) is 

m= \frac{9-7}{-4-3}= \frac{2}{-7}=- \frac{2}{7}


the equation of the line is :

y-7=- \frac{2}{7}(x-3)\\\\y-7=- \frac{2}{7}x+ \frac{6}{7}\\\\y= - \frac{2}{7}x+ \frac{6}{7}+ \frac{49}{7}\\\\y=  - \frac{2}{7}x+ \frac{55}{7}


C(a, 1) is on this line so it must satisfy the equation:

y=  - \frac{2}{7}x+ \frac{55}{7} \\\\1=  - \frac{2}{7}a+ \frac{55}{7}\\\\ \frac{2}{7}a= \frac{48}{7}\\\\2a=48\\\\a=24
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4 years ago
Please help 15 MATH PROBEL
Volgvan

Answer:

x=2

Step-by-step explanation:

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Step-by-step explanation:

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