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3 years ago

Help please! 99 Points!

2 answers:

7 0

Hey there,

As seeing the (mathematics's above) I would be more willing list the steps, but to just tell you the answer.

$\boxed{y = -2.56}$ and also $\boxed{y =1.88}$

Hope this helps.

~Jurgen

WITCHER [35]3 years ago

3 0

Combination method: add the two equations together

5)   <span>4x-9y=1 6) 3x - 2y = 14
+( - 4x+6y=-2 ) + (2x + 2y = 6)
---------------------- -------------------
0 - 5y = -1 5x + 0 = 20

-5y = -1 5x = 20

isolate the y isolate the x

-5y / -5 = -1/-5 5x/5 = 20/5

y = 1/5 x = 4

</span>4x-9y=1 3x - 2y = 14
4x - 9(1/5) = 1 3(4) - 2y = 14
4x - 9/5 = 1 12 - 2y = 14
4x - 9/5 (+9/5) = 1 (+9/5) 12 (-12) - 2y = 14 (-12)
4x = 14/5 -2y = 2
4x/4 = 14/5(/4) -2y(/-2) = 2(/-2)
x = 14/20 y = -1

Elimination method

7) 4x + 3y = 29 + (5x + 2y = 24)
eliminate one of the variables by multiply the number to both sides

2 (4x + 3y = 29) + 3 (5x + 2y = 24)

8x + 6y = 58
-( 15x + 6y = 72)
----------------------
-7x = - 14
-7x/-7 = -14/-7

x = 2

4(x) + 3y = 29
4(2) + 3y = 29
3y + 8 = 29
3y + 8 (-8) = 29 (-8)
3y = 21
3y/3 = 21/3

y = 7

8) like #7, you must   eliminate one of the variables by multiply the number to both sides

-4x - 2y = 14
-10x + 7y = -25

7(-4x - 2y = 14)
-2(-10x + 7y = -25)

-28x - 14y = 98
- (20x -14y = -25)
-----------------------
-48x = 123
-48x/-48 = 123/-48
x = -2.56

-4(-2.56) - 2y = 14
10.24 - 2y = 14
10.24(-10.24) - 2y = 14 (-10.24)
-2y = 3.76
-2y/-2 = 3.76/-2
y = -1.88

hope this helps

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