Answer:
Kevin was eleven years old.
Step-by-step explanation:
7+4=11, since the question says Matthew is younger by four years.
Answer:
c=f(x)−ax^2−bx
Step-by-step explanation:
Answer:
x = 12
y = 4
Step-by-step explanation:
x + y = 16
x - y = 8
y + 8 = x
Replace x with y + 8 in the new equation
8 + 2y = 16 ----> we can minus 8 on both sides
2y = 8 -----> divide both sides by 2
y = 4
Now for the x value
x + 4 = 16 ----> minus 4 on both sides
x = 12
