Solve for x?

Question

Solve for x and then check your answers? Will someone help me out with this?

1.) -3x = 27


2.) 3/7x = 15

(Second problem is a fraction 3/7 with x right behind it)

Answer 1

sure, its pretty easy all you have to do is divide both sides of the equation with the quantity of x
1) -3x = 27
...divide both sides by -3
x = 27/-3 = -9

2) (3/7)x = 15
x = 15 * (7/3)
...remember when you "divide by a fraction" you are actually "multiplying by its inverse" ... IE turn it upside down and multiply instead fo divide
x = 35

Answer 2

Also, a good trick to remember when you are multiplying fractions is that you can sometimes "cancel out" numbers:
3/7x=15
x=15*(7/3)
In this case, the denominator of one fraction and the numerator of the other have a common factor in 3. If you divide both by 3, the problem merely becomes:
x=5*7.
Sometimes that can really help you figure our problems quicker when you can identify a common factor in that way.

Answer 3

All answer are incorrect or partly genuine! The is a attempt whether the equation holds. because of the fact the quotient x/x is given, the equation is defined for x=0, because of the fact the fact, that there is a real decrease for x goint to 0 of x/x: limit_x->0 x/x=a million. So do away with the quotient a minimum of for x unequal 0. The equation now's x+x²=x². This equation would be rearranged by way of unique arithmetic operations. It supplies x=0. stupid or. What does is advise? The equation does not carry for x unequal 0. it somewhat is it. it could returned be simplified a million+x=x or a million=0, that's incorrect. For 0 is holds interior the stable type and interior the decrease attention: 0/0+0=a million+0 unequal 0. The equation does not be valid for any actual numbers!

Answer 4

-3x = 27
divide both sides by -3
x = -9
check (-3)(-9)=27 TRUE

3/7x = 15
divide both sides by 3/7
"invert and multiply"
(7/3)(3/7)x=(7/3)(15)
(21/21)x=(105/3)
x=35
check: (3/7)(35)=15 TRUE

Answer 5

1.
-3x = 27 (Divide both sides by '-3').
-3/-3 x = 27/-3 (-3/-3 = 1 on LHS)
x = -9

2.
3/7x = 15 (Multiply both sides by '7').
3 x 7/7 x = 15 x 7 (7/7 = 1 on LHS)
3x = 105 (Divide both sides by '3').
3/3x = 105/3 (3/3 = 1 on LHS)
x = 35

Hope you now understand how its done!!!!!

Answer 6

1. divide each size by -3. so you'll have x=-9

2. multiple both sides by 7/3, you'll have x=15(7/3) or 35

Answer 7

-3x=27
-- ----
-3 -3

27/-3=-9
x=-9

3/7x=15
3/7=0.42857142857142854
15/0.42857 =6.42857
6.42857=x

Answer 8

1.) x=9
idk how to the 2nd prob