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Crazy boy [7]
3 years ago
15

Ryan is trying to determine whether 2.7x – 5.9 is equivalent to 2.8x – 5.9. To test this, he substitutes 0 for x into both expre

ssions. Explain why this will not give him the correct answer.
Mathematics
2 answers:
Svetlanka [38]3 years ago
8 0

Answer:

See below.

Step-by-step explanation:

It's because any number multiplied by 0 equals 0. We could put any 2 numbers other than 2.7 and 2.8 yet still get both sides of the  equation = - 5.9 but the 2 sides are obviously not equal.

To do the test correctly he can use any number except 0.

butalik [34]3 years ago
8 0

Answer:

Sample Response: The coefficients of x are different in the expressions, but the constant values are the same. Zero times any value is zero, so both expressions will be equal to –5.9. If Ryan tried any other number, he would see that the expressions are not equivalent.

Step-by-step explanation:

Sample Response

plz give brainliest

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Solve the system of equations.
guajiro [1.7K]

Answer:

Option 2: (1, 0) and (0, -5)

Step-by-step explanation:

Let's solve this system of equations using the elimination method.

Start by labelling the two equations.

5x -y= 5 -----(1)

5x² -y= 5 -----(2)

(2) -(1):

5x² -y -(5x -y)= 5 -5

Expand:

5x² -y -5x +y= 0

5x² -5x= 0

Factorise:

5x(x -1)= 0

5x= 0 or x -1= 0

x= 0 or x= 1

Now that we have found the x values, we can substitute them into either equations to solve for y.

Substitute into (1):

5(0) -y= 5 or 5(1) -y= 5

0 -y= 5 or -y= 5 -5

y= -5 or -y= 0

y= 0

Thus, the solutions are (0, -5) and (1, 0).

3 0
2 years ago
3 to the power of 2 + (15 ÷ 5 × 6) − 49
grin007 [14]

Answer:

i think its -31

Step-by-step explanation:

thats what i got

hope this helps :)

7 0
3 years ago
Read 2 more answers
What equation describes the circle that is centered at (8, 3) and has a radius of 9
Sloan [31]

Answer:

<h3> (x-8)²+(y-3)² = 81</h3>

Step-by-step explanation:

The general equation of a circle is expressed as;

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r is the radius

Given the centre (8, 3) and the radius of 9, the equation of the circle will be;

(x-a)²+(y-b)² = r²

(x-8)²+(y-3)² = 9²

(x-8)²+(y-3)² = 81

hence the required equation is  (x-8)²+(y-3)² = 81

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eimsori [14]
Range is the difference between the largest and the smallest numbers in a given contest

Hence the range
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3 years ago
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