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Andrei [34K]
2 years ago
6

2x + y = 7 -4x = 2y + 14 Is it single solution No solution or many solution

Mathematics
1 answer:
gogolik [260]2 years ago
4 0

Answer:

Step-by-step explanation:

o no bby

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Answer:difference of two squares will be  

16y^2 -x^2 = (4y -x)(4y +x)

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Step-by-step explanation:

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3 years ago
One number is 3 times more than another number. Their sum is 20. What are the two numbers?
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3 years ago
3x-4 or = to 7<br><br><br> plz help
lisabon 2012 [21]

Answer:

3 + 4 = 7  which is true.

Step-by-step explanation:

Whenever you have an equation with a plain variable (that is, no exponent included), there is only one number that will work when substituted for x.

To solve it, you have to "undo" what is done to the variable. You also go in the reverse order of operations, so you do the addition/subtract first, then multiplication/division.

You also have to do the same to both sides, kind of like keeping a balance scale in balance.

In this case, we subtract 4 from both sides first:

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The + 4 - 4 cancel each other out, so you get:

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Since 1x is "1 times x" it is the same as x by itself, so:

x=1

AND, if we substitute 1 back into the original equation (the asterisk stands for multiply):

3 * 1 + 4 = 7

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3 + 4 = 7     which is true.

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