Consider the following pair of equations:
y = 3x + 3 y = x − 1
Explain how you will solve the pair of equations by substitution. Show all the steps and write the solution in (x, y) form.
Look at the second equation
y = x -1
y + 1 = x sub this into the first equation for x
y = 3 ( y + 1) + 3
y = 3y + 3 + 3
y = 3y + 6
y -3y = 6
-2y = 6
y = 6 / -2 = -3
And x = y + 1 = -3 + 1 = -2
(x , y) = (-2, - 3)
