After substituting x=8 into −9x+7y=−16, we find that y=8. The final answer is the ordered pair (8, 8), which is not among the provided options.
To solve the system of equations −9x+7y=−16 and x=8 using substitution, we first substitute the value of x into the first equation.
−9(8) + 7y = −16
−72 + 7y = −16
7y = −16 + 72
7y = 56
y = 8
Now that we have the value of y, we can write the final answer using the given x value:
x = 8
y = 8
Therefore, the solution to the system is the ordered pair (8, 8).
So, option A (2,−6), B (−2,6), C (−1,3), and D (1,−3) are all incorrect. The correct final answer is none of the given options.