Question

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.

Answer 1

Since both of the equations equal Y can substitute one for the Y and say that

X-1=3x+3

-4=2x

-2=x

You then plug the x into the original equation

-2-1=y

Y=-3

(-2,-3)

Step-by-step explanation:

I took the test and this is what I typed and got it correct. Hope it helps!

Answer 2

first substitute y = x - 1 in y = 3x + 3 , so

3x + 3 = x - 1

2x = -4

x = -2

Now substitute for x in the first equation:-

y =3(-2) + 3 = -6 + 3

y = -3


Answer is (-2, -3)