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lawyer [7]
3 years ago
11

Use substitution to solve the system. x=3y+5 5x-4y=14 ______________ x= y=

Mathematics
1 answer:
nataly862011 [7]3 years ago
8 0
So what you do is go 5(3y+5)-4y=14 which equals 15y+25-4y=14 which turns into 11y+25=14 than you move the 25 over which equals 11y=-11 so y=-1 then you enter -1 in for y which looks like 5x-4(-1)=14 than you solve that which is 5x+4=14 than you move the 4 over and you get 5x=10 than x=2

x=2
y=-1
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maw [93]

Answer:

m∠1=80°

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m∠3=131°

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Step-by-step explanation:

First you have to find m∠2

To do that find m∠6 (I created this angle shown in pic below)

Find m∠6 by using the sum of all ∠'s in a Δ theorem

m∠6=180°-(63°+49°)

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m∠2=180°-68°

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m∠1=180°-100°=80°

m∠4 can easily be found too now:

m∠4=180°-(63°+37°)

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