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3 years ago

Solve the system using elimination PLEASE SHOW ALL WORK 5x+4y=12 3x-3y=18

2 answers:

7 0

5x + 4y = 12....multiply by 3
3x - 3y = 18 ...multiply by -5
----------------
15x + 12y = 36 (result of multiplying by 3)
-15x + 15y = - 90 (result of multiplying by -5)
----------------------add
27y = - 54
y = -54/27
y = -2

5x + 4y = 12
5x + 4(-2) = 12
5x - 8 = 12
5x = 12 + 8
5x = 20
x = 20/5
x = 4

solution is : (4,-2) <=

Step2247 [10]3 years ago

3 0

5x+4y=12Step 1: Add -4y to both sides.5x+4y+−4y=12+−4y5x=−4y+12Step 2: Divide both sides by 5.5x5=−4y+125x=−45y+125Answer:x=−45y+125
question 2:
3x−3y=18Step 1: Add 3y to both sides.3x−3y+3y=18+3y3x=3y+18Step 2: Divide both sides by 3.3x3=3y+183x=y+6Answer:x=y+6

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Time passed for both me and my friend will be equal if we start at the same time and the combined distance covered by both of us will be 24 miles. Let $t$ be the time taken to meet

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$\dfrac{26}{3}t+\dfrac{22}{3}t=24\\\Rightarrow \dfrac{48}{3}t=24\\\Rightarrow 16t=24\\\Rightarrow t=\dfrac{24}{16}\\\Rightarrow t=1.5\ \text{hours}$

So, we meet each other after 1.5 hours.

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$\dfrac{26}{3}\times 1.5=13\ \text{miles}$

Distance traveled by my friend

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2 years ago

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Step-by-step explanation:

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2 years ago

Read 2 more answers

Triangle DEF has sides with lengths of 6, 11, and 13 units. Determine whether this triangle is a right triangle. Show all work n

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Answer:

Triangle DEF is not a right triangle ; possible lengths are 20 & 15

Step-by-step explanation:

For right triangle;

the sum of the square of the two adjacent sides must equal the square of the hypotenus.

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2 years ago