Answer:
Hi, welcome to concept of Linear equations with two variables
Explanation:
eqn: y = 4x + 11
1.) for x = 6
y = 4(6) + 11
y= 24 + 11
y= 35
2.) for x = 12
y= 4(12)+11
y=48+11
y = 59
3.) for y = -21
-21 = 4x +11
4x = -21 -11
4x = -32
x = -32÷4
x = -8