3 years ago

I'm doing a 2 step equation and i forgot how to isolate the x

Mathematics

1 answer:

soldier1979 [14.2K]3 years ago

8 0

12.6666667 is your answer

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A number decreased by 9 is 12. Which equation represents this situation?

Mice21 [21]

Answer:

x - 9 = 12

Step-by-step explanation:

We can use x as "a number"

So the equation so far is just "a number", or x.

Decreased by 9 can also be said as subtracted by 9, so that makes the equation x - 9.

"is 12" can also be said as equals 12, which makes the equation x - 9 = 12

4 0

3 years ago

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Solve the system of equations by substitution y=5x-13 and 5x+2y=19

castortr0y [4]

Y = 5x - 13 ----------- (1)
5x + 2y = 19 --------- (2)

Sub (1) into (2):

5x + 2(5x -13) = 19
5x + 10x - 26 = 19
15x = 19 + 26
15x = 45
x = 3 -------- sub back into (1)
y = 5(3) - 13
y = 15 - 13
y = 2

Ans: x = 3, y = 2

6 0

3 years ago

A rectangular solid measures 150cm by 100cm by 200cm calculate the volume, in cm3 and in dm3 show conversion factors

vesna_86 [32]

Answer:

3000000cm³

3000dm³

Step-by-step explanation:

150cm x 100cm x 200cm = 3000000cm³

$(3000000cm^{3}) (\frac{(10)^{3}(dm)^{3} }{(100)^{3}(cm)^{3} }) = 3000dm^{3}$

8 0

3 years ago

Lin took 75 boxes of carrots and 80 boxes of potatoes to the market. She sold 68 boxes of carrots and 71 boxes of potatoes. How

enot [183]

For this case we have:

x: Represents the number of carrot boxes

y: Represents the number of boxes of potatoes

Initially we have:

$x = 75\\y = 80$

If you sold 68 boxes of carrot we have:

$x = 75-68 = 7$

If you sold 71 boxes of potatoes, we have:

$y = 80-71 = 9$

The number of boxes I take home is given by: $x + y = 7 + 9 = 16$

ANswer:

7 boxes of carrots left

There are 9 boxes of potatoes left

A total of 16 boxes remain

8 0

4 years ago

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Estimate the product and choose a method

Ainat [17]

What is the product??

3 0

3 years ago