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Tema [17]
3 years ago
9

-7y = -84 what does y equal

Mathematics
2 answers:
Brut [27]3 years ago
6 0
To "solve" equation with a single variable you perform whatever operations necessary to isolate the variable by itself on one side of the equal (or inequality) sign.  Because it is an equality whatever operation you perform on one side you must also perform on the other side, otherwise you eliminate the equality of the expression or equation...

-7y=-84  divide both sides by -7

y=12
babunello [35]3 years ago
4 0
Okay, so first you need to divide both sides by -7!

That would leave you with y = 12 because:

-7y / -7y = y
-84 / -7 = 12

That equals

y = 12! Have a great day and I hope I helped!
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∠E and ∠F are vertical angles with m∠E=8x+8 and m∠F=2x+38 .<br><br> What is the value of x?
Zigmanuir [339]
We know that ∠E = ∠F because of the vertical angle theorem.

Using substitution we get 8x + 8 = 2x + 38

Solve for x.

8x + 8 = 2x + 38
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3 years ago
A number divided by 14
insens350 [35]

Answer:

x÷14

Step-by-step explanation:

8 0
3 years ago
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8n + 12 - 5n = 21<br> n=?
insens350 [35]

Answer:

n=3

Step-by-step explanation:

Simplifying

8n + 12 + -5n = 21

Reorder the terms:

12 + 8n + -5n = 21

Combine like terms: 8n + -5n = 3n

12 + 3n = 21

Solving

12 + 3n = 21

Solving for variable 'n'.

Move all terms containing n to the left, all other terms to the right.

Add '-12' to each side of the equation.

12 + -12 + 3n = 21 + -12

Combine like terms: 12 + -12 = 0

0 + 3n = 21 + -12

3n = 21 + -12

Combine like terms: 21 + -12 = 9

3n = 9

Divide each side by '3'.

n = 3

Simplifying

n = 3

5 0
3 years ago
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What is the greatest common factor of 28 and 46?
tester [92]
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