Question

Use the Substitution Method to solve the following system of equations.
x - 4y = 1
2x - 9y = 3

(-1, -3)

(-3, 1)

(3, 1)

(-3, -1)

Answer 1

x=1+4y
Substituting in the 2nd eqn gives
2(1+4y)-9y=3
2+8y-9y=3
-y=1
y=-1
x=1-4
=-3
(-3,-1)