Question

Consider the following pair of equations:

y = x + 4
y = −2x − 2
Can someone please help me with this?

Will fan and give medal.
Explain how you will solve the pair of equations by substitution.

Answer 1

y = y
example 2 + 8 = 10 and 6 + 4 = 10 therefore
2 + 8 = 6 + 4

set the expressions equal and solve for x
put this value of x in either expression for y and find the value of y

good practice to check your solution in the original because it is very easy and very common to make arithmetic errors