2 answers:
So first we have to subtract 3y from 21 cause the oppisit of addition which is subtraction so you get 18y when we divide that with -8y and get y=2.25y
-8x + 3y = 21
-8x + 8x + 3y = 21 + 8x
<u>3y</u> = <u>21 + 8x</u>
3 3
y = 7 + 2 2/3x
-8x + 3(7 + 2 2/3x) = 21
-8x + 21 + 8x = 21
-8x + 8x + 21 = 21
0x + 21 = 21
0x + 21 - 21 = 21 - 21
<u>0x</u> = <u>0</u>
0 0
x = 0
-8(0) + 3y = 21
0 + 3y = 21
<u>3y</u> = <u>21</u>
3 3
y = 7
(x, y) = (0. 7)
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-8x + 3y = 21
-8x + 3y - 3y = 21 - 3y
<u>-8x</u> = <u>21 - 3y</u>
-8 -8
x = -2 5/8 + 3/8y
-8(-2 5/8 + 3/8y) + 3y = 21
21 - 3y + 3y = 21
21 - 0y = 21
21 - 21 - 0y = 21 - 21
<u>-0y</u> =<u> 0</u>
-0 -0
y = 0
-8x + 3(0) = 21
-8x + 0 = 21
<u>-8x</u> = <u>21</u>
-8 -8
x = -2 5/8
(x, y) = (-2 5/8, 0)
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