is the ordered pair (1, 2) is a solution of the system { -3x-y = 18
5x + 6y = -12 ?
i hve to explain yes or no and why

(1, 2) is not a solution

Step-by-step explanation:

To determine if the point is a solution substitute the coordinates into the left side of both equations and if equal to the right side then the point is a solution.

- (3 × 1) - 2 = - 3 - 2 = - 5 ≠ 18

(5 × 1) + (6 × 2) = 5 + 12 = 17 ≠ - 12

Hence (1, 2) is not a solution of the system of equations

3. (5x + 1) - (-10x + 6)

simplify the answer choice. combine like terms. remember to distribute the negative to the terms inside the second parenthesis. also remember that two negatives = one positive, and one of each sign = negative.

- (-10x + 6) = + 10x - 6

simplify. combine like terms:

5x + 1 + 10x - 6

5x + 10x + 1 - 6

15x - 5

∴ it is your answer

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