Question

What is the solution to the system of equations?

y=18x−1

−5x+4y=−13

(
,
)

Answer 1

Substitute y = 18x − 1 into −5x + 4y = −13:

−5x + 4(18x − 1) = −13
−5x + 72x − 4 = −13
67x = −9
x = −9/67

y = 18(−9/67) − 1 = −162/67 − 67/67 = −229/67

Solution: (−9/67, −229/67).