Solve this system of equations using substitution. x=4 3x−y=−1

y=13

Step-by-step explanation:

12-y=-1

-y=-13

y=13

Step-by-step explanation:

Here you go mate

Step 1

x=4  

Step 2

3x-y=-1  Substitute 4 for x

(3)(4)-y=-1

-y=-13

Step 3

-y=-13  Divide both sides

answer

y=13

to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

the answers might not be correct use at own risk