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Anna11 [10]
3 years ago
14

1.) 4x = 16

Mathematics
1 answer:
IrinaK [193]3 years ago
5 0
1) answer is x = 4. (simply divide both sides by 4 and simplify)

(2) answer is t = 16 (just simplify, multiply both sides by 4, multiply 12 x 4, divide both sides by 3, and simplify again.)

(3) answer is r = 13 (subtract 5 from both sides, subtract 31 - 5, divide both sides by 2, and simplify fraction)

(4) answer is n = 7 (add 7 to both sides, add 21 + 7, divide both sides by 4, and simplify fraction again)

(5) answer is a = 12 (subtract 2 from both sides, subtract 6 - 2, multiply both sides by 3, and multiply 4 x 3 and u get 12)

(6) answer is y = 40 (add 8 to both sides, add 2 + 8, multiply both sides by 4, multiply 10 x 4 and u get 40)
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Please use method of substitution numbers 9;10;11;12
rodikova [14]

Answer:

1.    x = 1, y = 2.

12.  x = 1, y = -3.

Step-by-step explanation:

I won't do all these for you, just the first and the last. The method is similar  for all 12.

1.

y = x + 1

x + y = 3

Substitute y = x + 1 into the second equation:

x + y = 3 so:

x + (x + 1) = 3

2x + 1 = 3

2x + 1 -1 = 3 - 1

2x = 2

x = 1.

Now substitute x = 1 into the first equation to get the value of y:

y = x + 1

y = 1 + 1

y = 2.

12.

4x = y + 7

3x + 4y + 9 = 0

Solve for y in the first equation:

4x = y + 7                Subtract 7 from both sides of the equation:

4x - 7 = y + 7 - 7

y = 4x - 7.

Now substitute  y = 4x - 7 in the second equation:

3x + 4y + 9 = 0   so:

3x + 4(4x - 7) + 9 = 0

3x + 16x - 28 + 9 = 0

19x - 19 =  0

19x - 19 + 19 = 0 + 19

19x = 19

x = 19/19 = 1.

Now substitute x = 1 in the first equation:

4x = y + 7

4*1 = y + 7              Subtract 7 from both sides of the equation:

4 - 7 = y + 7 - 7      

-3 = y.

5 0
3 years ago
There are 250 bricks used to build a wall that is 20 feet high how many bricks will be used to build a wall is 40 feet high?
Lady bird [3.3K]

Answer:

500 bricks.

Step-by-step explanation:

There are 250 bricks used to build a wall that is 20 feet high how many bricks will be used to build a wall is 40 feet high?

To solve e the above question, we have:

20 feet high = 250 bricks

40 feet high = x bricks

Cross Multiply

20 feet × x bricks = 40 feet × 250 bricks

x bricks = 40 feet × 250 bricks/20 feet

x bricks = 500 bricks

Therefore, 500 bricks will be used to build a wall is 40 feet high.

6 0
3 years ago
What two numbers multiple to equal 16 but add up to equal -17​
ELEN [110]

Answer:

-16 and -1

Step-by-step explanation:

-16 *-1 = 16

-16+-1=-17

5 0
3 years ago
Water costs $1.25 per bottle. At this rate, what is the cost of 10 bottles?
antoniya [11.8K]
The answer is $12.5 for 10 bottles
8 0
3 years ago
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Philip walked a total of 8 kilometers by making 2 trips to school. After 3 trips to school, how many kilometers will Philip have
vekshin1
So one trip = 4 km
two trips = 8
8 + 4 = 12
i believe your answer is 12
Thanks!
7 0
3 years ago
Read 2 more answers
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