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Step-by-step explanation:

The student's arithmetic is incorrect

To determine if (1, - 2) is a solution to the system of equations

Substitute x = 1 and y = - 2 into the left side of both equations and if equal to the right side then the point is a solution to the system.

5x - y = 5(1) - (- 2) = 5 + 2 = 7 = right side

x + 4y = 1 + 4(- 2) = 1 - 8 = - 7 ≠ - 5

The point does not satisfy the second equation.

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

the equation cos(35) =a/25 can be used to find the length of bc what is the length of bc? round to the nearest tenth

step-by-step explanation: