Find the solution to the system of equations by substitution.
-9x + y = 0 -9x + y = -18
A) (1, 18)
B) (1, -9)
C) (-1, 9)
D) (-1, -9)

Question

Quizplus · Accepted Answer

From the first equation, we know that y = -9x. 
We can substitute this into the second equation: -9x + (-9x) = -18 
Simplifying, we get -18x = -18, or x = 1. 
Substituting x = 1 into y = -9x gives y = -9. 
Therefore, the solution is (1, -9), which corresponds to choice B.

Find the Solution to the System of Equations by Substitution