Question

What is the solution to this system? Solve by substitution. y= 4x +3 and 2x - 3y = 21​

Answer 1

Are they 2 different problems that need to be solved ?

Answer 2

x= -3

y= -9

Explanation:

Y-4X =3 ; 2x-3y=21

Y= 3+ 4x

2x -3( 3+4x)= 21

2x- 9- 12x= 21

-10x -9= 21

-10x -9+9= 21+9

-10x = 30

X= 30/-10= -3

Y= 3+4x = 3+ 4* (-3)= 3-12= -9