Find the difference (8ab+2a-9)-(7ab-5)
1 answer:
(8ab+2a-9)-(7ab-5)
= 8ab+2a-9 - 7ab + 5
= ab + 2a -4 (combine like terms)
= 2a + ab - 4
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Answer:
ask the person that is watching the question
I'll show you two ways.
By substitution:
![x+3y=11\\ 2x-y=1\\\\ x=11-3y\\ 2x-y=1\\\\ 2(11-3y)-y=1\\ 22-6y-y=1\\ -7y=-21\\ y=3\\\\ x=11-3\cdot3\\ x=11-9\\ x=2\\\\ \boxed{(x,y)=\left(2,3\right)}](https://tex.z-dn.net/?f=x%2B3y%3D11%5C%5C%0A2x-y%3D1%5C%5C%5C%5C%0Ax%3D11-3y%5C%5C%0A2x-y%3D1%5C%5C%5C%5C%0A2%2811-3y%29-y%3D1%5C%5C%0A22-6y-y%3D1%5C%5C%0A-7y%3D-21%5C%5C%0Ay%3D3%5C%5C%5C%5C%0Ax%3D11-3%5Ccdot3%5C%5C%0Ax%3D11-9%5C%5C%0Ax%3D2%5C%5C%5C%5C%0A%5Cboxed%7B%28x%2Cy%29%3D%5Cleft%282%2C3%5Cright%29%7D)
By elimination:
The one that isn't the same is 16 because it's not divisible by three and all the others numbers are