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3 years ago

12

Using the substitution method, Vito is solving the following system of equations algebraically: y + 3x = -4 2x-3y = -21% D Which

equivalent equation could Vito use?

1 answer:

masha68 [24]3 years ago

8 0

Answer:

He could use y+3x=-4

Step-by-step explanation:

When we subtract 3x on both sides, we get y=-4-3x, which means we just solved a variable and can substitute into the other equation 2x-3y=-21

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Answer: x= -6 I'm not sure about this though.

Step-by-step explanation:

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3 years ago

Isaac drove at an average speed of 49 mph over 6 hours during the first three hours he drove at a speed that was 172 mph less th

IgorC [24]

Isaac drove the car at 44 mph during last three hours.

Step-by-step explanation:

Average speed = 49 miles per hour

Let,

s be the speed during last three hours

4s-172 be the speed during first three hours

Average = $\frac{Sum\ of\ items}{No.\ of\ items}$

$49=\frac{4s-172+s}{2}\\\\49*2=5s-172\\\\98=5s-172\\\\98+172=5s\\\\270=5s\\\\5s=270$

Dividing both sides by 5

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Keywords: division, addition

Learn more about addition at:

#LearnwithBrainly

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3 years ago