The answer is: "17 units" .
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<u>Note</u>:
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24 - 7 = 17 .
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1: Solve for either x or y in one of the equations. So x + y = -1 is y = -x -1
2: substitute the new equation in the opposite equation. So x - (-x - 1) = 7
3: distribute the negative. X + x + 1 = 7
4: combine like terms. 2x + 1 = 7
5: solve for x. Subtract 1 on both sides. 2x = 6
6: divide by 2 to get x by itself. X = 3
7: plug the new value of x into one of the ORIGINAL equations. 3 + y = -1
8: solve for y. Subtract 3 on both sides.
Y = -4
9: the solution is written as (x,y) so the solution would be (3, -4)
Assume simple interest.
I=Pin
=>
54=900*i*(18/12)
=>
i=54/900*12/18
=0.04
=4%
Annual simple interest rate is 4%
