Answer:
Step-by-step explanation:
Write x + 4 = 6 and x- 2y=18 vertically:
x + 4 = 6
x - 2y =18
Multiply the 2nd row by -1, obtaining:
x + 4 = 6
-x + 2y = -18
(2, -8)
Combine the two equations:
x + 4 = 6
-x + 2y = -18
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2y + 4 = -12, or 2y = -16, or y = -8.
We can tell immediately from the first equation that x = 2.
Thus, the solution is (2, -8).
Does this satisfy the second equation?
Is (2) - 2(-8) = 18 true?
Is 2 + 16 = 18 true? YES.
