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3 years ago

X2 can be combined with X?

Mathematics

2 answers:

natulia [17]3 years ago

3 0

Answer:

Your first instinct might be to go ahead and add the x terms together, BUT this would be a bad thing to do! You cannot combine the x2 and 2x, because the first term has an exponent (2) and the second one does not have an exponent; therefore, you cannot add them together!

Step-by-step explanation:

tino4ka555 [31]3 years ago

3 0

Answer:

Not sure if you mean multiplying or adding by "combine". But generally the rule of thumb with exponents is when you are adding and they are not like terms, you cannot combine the two terms together. So in other words, they would be left as x²+x. However, when you are multiplying you can add the exponents together. So, it will be like this: x²·x = x³

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3 years ago

X=4y+7 2x-6y=12 System of equations using substitution

Sonja [21]

Answer:

x=3, y=-1

Step-by-step explanation:

We are already given an equation solved for x, making substitution much easier. We know x=4y+7, meaning we can put 4y+7 whenever we see x in the second equation

2x-6y=12

We substitute 4y+7 in place of x

2(4y+7)-6y=12

Now we only have one variable to work on, distribute the 2

8y+14-6y=12

Combine similar terms, 8y-6y=2y

2y+14=12

Subtract 14 from both sides

2y=-2

y=-1

Now we plug in -1 for y in the first equation to find x

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3 years ago

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quester [9]

Answer:

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3 years ago

Brielle exercises for 3/4 hour each day for 6 days in a row. altogether, how much hours does she exercise during the 6 days? Ple

Talja [164]

Answer:

She exercises for 4.5 hours during these 6 days.

Step-by-step explanation:

In this question:

Each day, she exercises 3/4 of an hour a day.

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