If 2x +y=-7 and 3x=6+4y are simultaneous equation, what is the value of x-y
1 answer:
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We can check each of these using the Pythagorean Theorem, 
Option A:
.25 + 1.44 = 1.691.69 = 1.69
This option works
Option B
1 + 4 = 9
5 ≠ 9
This option does not work, but let's check the others to make sure
Option C:
36 + 64 = 100
100 = 100
This option works
Option D:
9 + 16 = 25
25 = 25
This option works
So, after doing the calculations, we see that option B does not work
Option A:
.25 + 1.44 = 1.691.69 = 1.69
This option works
Option B
1 + 4 = 9
5 ≠ 9
This option does not work, but let's check the others to make sure
Option C:
36 + 64 = 100
100 = 100
This option works
Option D:
9 + 16 = 25
25 = 25
This option works
So, after doing the calculations, we see that option B does not work