Which ones are like terms and how can you tell? -8h 4h 3t 7t -4e 3e -2b b

Mathematics

1 answer:

Soloha48 [4]2 years ago

3 0

Answer:

1) -8h and 4h

2) 3t and 7t

3) -4e and 3e

4) -2b and b

Step-by-step explanation:

They all have the same variable as the other in the pair. There aren't any other variables added or exponents.

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At beginnings of population study a city had 330,000 people. Eac year since, the population has grown by 6.8% . let t be the num

insens350 [35]

Answer:

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Step-by-step explanation:

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3 years ago

solve this system of linear equations. Separate the X- and Y- values with a comma. -9x+2y=-16 19x+3y=41

Serjik [45]

Answer:

(2, 1)

Step-by-step explanation:

The best way to do this to avoid tedious fractions is to use the addition method (sometimes called the elimination method). We will work to eliminate one of the variables. Since the y values are smaller, let's work to get rid of those. That means we have to have a positive and a negative of the same number so they cancel each other out. We have a 2y and a 3y. The LCM of those numbers is 6, so we will multiply the first equation by a 3 and the second one by a 2. BUT they have to cancel out, so one of those multipliers will have to be negative. I made the 2 negative. Multiplying in the 3 and the -2:

3(-9x + 2y = -16)--> -27x + 6y = -48

-2(19x + 3y = 41)--> -38x - 6y = -82

Now you can see that the 6y and the -6y cancel each other out, leaving us to do the addition of what's left:

-65x = -130 so

x = 2

Now we will go back to either one of the original equations and sub in a 2 for x to solve for y:

19(2) + 3y = 41 so

38 + 3y = 41 and

3y = 3. Therefore,

y = 1

The solution set then is (2, 1)

6 0