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nataly862011 [7]
3 years ago
13

Solve the system by the elimination method.

Mathematics
1 answer:
REY [17]3 years ago
8 0

Answer: C is correct, 4x=8

Step-by-step explanation:

You will add the two equations...

4x-8=0

Now you need to move the -8 over, which reverses its sign to positive.

4x=8

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3 years ago
-2+y=9 3x-7y=3 solve the system by the substitution
REY [17]

Answer:

80/3 or 26 2/3

Step-by-step explanation:

-2 + y = 9 (subtract y from both sides)

-2 = 9 - y (subtract 9 from both sides)

-2 - 9 = y (multiply both sides by -1)

2 + 9 = y (simplify)

11 = y (substitute)

3x - 7 (11) = 3 (multiply)

3x - 77 = 3 (subtract 3 from both sides)

3x - 80 = 0 (subtract 3x from both sides)

-80 = -3x (multiply both sides by -1)

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5 0
3 years ago
Use the dots for one and two. what is the difference between the ranges
sergij07 [2.7K]

Answer:

a. 20 points

Step-by-step explanation:

Range = Largest given value - Smallest given value.

<u>Identifying the range of test 1</u>

Looking at the dot plot the lowest test grade appears to be 50 while the highest is 90.

So range of test 1 = 90 - 50 = 40

<u>Identifying the range of test 2</u>

Looking at the plot the lowest test grade appears to be 40 while the highest appears to be 100

So range = 100 - 40 = 60

<u>Identifying the differences between the ranges</u>

Test 1 range : 40

Test 2 range : 60

Difference between the two : 60 - 40 = 20 points

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Step-by-step explanation:

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