Question

solve the system by the elimination method

4x-9y=18.5
7y-2x=10.5

Answer 1

x=22.4
y=7.9

Answer 2

no one is presenting these correctly, they have to be in a paired order of fractions

Answer 3

y=13,16

Answer 4

Let 1. => 4x - 9y = 18.5
and 2. => 7y-2x = 10.5

2 X 2. => 14y -4x = 21

Then 1. + 2 X 2.
Therefore,
(4x-4x) + (-9y + 14y) = 39.5
0x + 5y = 39.5
y = 39.5/5 = 79/10

Answer 5

http://www.mathportal.org/algebra/solving-system-of-linear-equations/elimination-method.php

Answer 6

y=5,26

Answer 7

Then such solve for x using y value.

Answer 8

no they were not

Answer 9

Start off by multiplying equation 2 by 2. This will cancel the x's.
We now have:
4x-9y = 18.5
-4x + 14y = 21
If we add together, we get:
5y = 39.5
Dividing through, we have: (39/2)/5 = y
To simplify the fraction, we just multiply 39/2 * 1/5
Which is 39/10.
Now plug this value for y into either equation above to get x.
7(39/10)-2x = 10.5
273/10-2x=105/10 - By making a common denominator.
-2x = -84/5 By subtracting 273/10 from both sides.
DIviding both sides by -2 gives us:
x = (-84/5)/-2
Now by multiplying -84/5 * -1/2 we have:
x = -84/10
Bringing to LCD, we have:
x = -42/5

If this helps please give me a medal.

http://www.tutorsean.net for free math videos.

Answer 10

There is your METAL bro Cali23760 is mean :(.