Question

Y=-x+1 23 = 5y - 4x How do I find x and y by using substitution?

Answer 1

Answer:

x = -2  y = 3

Step-by-step explanation:

Equation 1:  y = -x + 1

Equation 2: 23 = 5y -4x

Take and plug in what y equals (from equation 1) into equation 2

23 = 5(-x+1) - 4x

23 = -5x + 5 - 4x

23 = -9x + 5

18 = -9x

x = -2

Then plug the -2 in to the first equation for x

y = -(-2) + 1

y = 2 + 1

y = 3

Answer 2

Answer:

final answer x= -2, y=3

Step-by-step explanation:

y= -x +1 (1)

23=5y-4x --> 5y=4x+23  (2)

Substitute (1) into (2)

5(-x+1)=4x+23

-5x+5=4x+23

-5x-4x=23-5

-9x=18

x=-2

substitute x=2 into (1) y=-(-2)+1, y=3