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charle [14.2K]
3 years ago
7

Write a number sentence to add 6 tens 21

Mathematics
2 answers:
Dahasolnce [82]3 years ago
8 0
6*10+21 IS the number sentence
vfiekz [6]3 years ago
3 0

Answer:

6 tens to 21 = 81

Step-by-step explanation:

Given

6 tens

21

To write a number sentence to represent the description in the question, follow these steps;

  • Convert 6 tens to number: From number representation, we know that tens can be replaced by 10;

So,

6 tens = 6 * 10

6 tens = 60

  • Then we add the result to 21

60 + 21

This gives a result of 81.

So, Addition of 6 tens to 21 is equal to 81

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Step-by-step explanation:

To know which choice has the same equation in both forms, we need to transform the standard form into the slope intercept form.

Then, solving for y in the first equation, we get:

8x + 4y = 12\\8x + 4y - 8x = 12 -8x\\4y=12-8x\\\frac{4y}{4}=\frac{12-8x}{4} \\y=3 - 2x\\y=-2x+3

It means that 8x + 4y = 12 &   y = -2x + 3 are the same equations.

At the same way, we get that:

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6x + 3y = 18\\6x + 3y - 6x = 18-6x\\3y=18-6x\\\frac{3y}{3}=\frac{18-6x}{3} \\y=6 - 2x\\y=-2x+6

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2x + 4y = 8\\2x + 4y -2x= 8-2x\\4y=8-2x\\\frac{4y}{4}=\frac{8-2x}{4}\\  y=2-\frac{1}{2}x

  • 3x + 4y = 12 &  y = ¾x + 3 are not the same equation:

3x + 4y = 12\\3x + 4y -3x= 12-3x\\4y=12-3x\\\frac{4y}{4}=\frac{12-3x}{4}\\  y=3-\frac{3}{4}x

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Step-by-step explanation:

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