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:( WHYYYYYY WHATS WRONG????!!!!!!!!!! :(   

I love Math.

3x - y = 18

4x + 2y = 24 

Add y to both sides of the first equation and subtract 18 from both sides

3x - 18   = y

Substitute this into the second equation for y

4x + 2(3x - 18)  = 24    simplify

4x + 6x - 36  = 24    add 36 to both sides and simplify the left side

10x  = 60    divide both sides by 10

x = 6  

And using   3x - 18 = y   →  3(6) - 18 = 18 - 18  =  0  = y

4u^2+4u+1=75   subtract 75 from both sides

4u^2 + 4u  - 74  = 0        divide through by 2

2u^2 + 2u - 37 =   0        since this won't factor, use the quadratic formula

u =  [ -2 ± √ [ 2^2 - 4(2)(-37)]  / 4   =

 [ -2  ± √ [4 + 296 ] / 4   =

[ -2  ± √ [300 ] / 4   =  

[-2  ± √ 10√3 ] / 4   =

[ -1  ±  5√3 ] / 2

Factor the following:
-3 x^2-5 x-2

Factor -1 out of -3 x^2-5 x-2:
-(3 x^2+5 x+2)

Factor the quadratic 3 x^2+5 x+2. The coefficient of x^2 is 3 and the constant term is 2. The product of 3 and 2 is 6. The factors of 6 which sum to 5 are 2 and 3. So 3 x^2+5 x+2 = 3 x^2+3 x+2 x+2 = (3 x+2)+x (3 x+2):
-(3 x+2)+x (3 x+2)

Factor 3 x+2 from (3 x+2)+x (3 x+2):
Answer: |-(3x + 2) (x + 1)

Solve the following system:
{3 x-y = -7
x-3 y = -13

In the second equation, look to solve for x:
{3 x-y = -7
x-3 y = -13

Add 3 y to both sides:
{3 x-y = -7
x = 3 y-13

Substitute x = 3 y-13 into the first equation:
{3 (3 y-13)-y = -7
x = 3 y-13

3 (3 y-13)-y = (9 y-39)-y = 8 y-39:
{8 y-39 = -7
x = 3 y-13

In the first equation, look to solve for y:
{8 y-39 = -7
x = 3 y-13

Add 39 to both sides:
{8 y = 32
x = 3 y-13

Divide both sides by 8:
{y = 4
x = 3 y-13

Substitute y = 4 into the second equation:
{y = 4
x = -1

Collect results in alphabetical order:
Answer: x = -1        and         y = 4

The point V(4, –1) is rotated 90° clockwise around the origin.

What are the coordinates of its image V’?

This point lies in the 4th quadrant

Note that the slope of a line drawn from the origin through this point will =  -1/4

And rotated 90° clockwise about the origin, this point will lie in the 3rd quadrant and will lie on a line with a  slope = 4/1 

So...in the 3rd quadrant, this point will be ( -1, - 4 )

Anytiime

Not so good. 

??????????

p.s. Not idiot, just curious

Please stop with this nonsense this is a math forum ok 

good

4+4=8

Plug in values for variables.

-(-2)^2-(5(-2)-2(-4))+7(-4)

A double negative is a positive.

2^2-(5(-2)-2(-4))+7(-4)

Work inside parentheses.  Multiply.

2^2-(-10-(-8))+7(-4)

Subtract inside parentheses.

2^2-(-2)+7(-4)

Solve exponent.

4-(-2)+7(-4)

Multiply.

4-(-2)+(-28)

Add and subtract from left to right.

6+(-28)

-22

Your answer is -22.  I hope this helps!!!

@-Happy7

z^3=343 take the cube root of both sides

z =343^(1/3)

z = 7

посчитать, что вы можете использовать калькулятор на главном экране с одним из расширений

z^3=343

7*7=49*7=343

z=7

@-Happy7