Find the x-value using substitution.

y = -3x + 11
5x + y = 21

5x+(-3x+11)=21

2x+11=21

2x=21-11

2x=10 2x/2=10/2

x=5

X = 5

Step-by-step explanation:

here's your solution

=> y= -3x + 11.

=> given equation = 5x + y = 21

=> by putting value of Y in given equation

=> 5x -3x + 11 = 21

=> 2x + 11 = 21

=> 2x = 21-10

=> x = 10/2

=> x = 5

hope it helps

b

step-by-step explanation: