Question

Mia must solve the system of equations

3x+4y=8
x-4y=4

As a first step she produces the equation 4x=12 from the system above. What property of equality can be
used to justify this much simpler equation?

Answer 1

x=3 and y=-¼

Explanation:

3x + 4y=8-(x-4y=4)

4x and 4x out then left 4x=12 By simplified and x = 3