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

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

both equations and proportions are better.

3; 9 is 8 to -4

step-by-step explanation: