2006-06-16 10:38:11 · 4 answers · asked by lisette11488 1 in Education & Reference ➔ Homework Help
If f is a linear function where f(x)=y, then it's of the form y = mx + b.
You know
8 = 4m + b
4 = 1m + b
Subtract the second equation from the first.
4 = 3m
4/3 = m
Substitute this back into the second equation:
4 = 4/3 + b
8/3 = b
So y = 4/3x + 8/3. Since for f(12) x=12,
y = 4/3 (12) + 8/3
= 48/3 + 8/3
= 56/3, or 18 2/3
2006-06-16 10:45:36 · answer #1 · answered by -j. 7 · 0⤊ 0⤋
Plot the points. You have 2 ordered pairs: (1, 4) and (4, 8), which gives you the slope of 4/3. See what value of of y would allow you to keep the slope consistent when x = 12. Still don't get it, I'll tell you the answer.
2006-06-16 10:47:14 · answer #2 · answered by Nikki W 3 · 0⤊ 0⤋
is that all the information. If so, you can;t solve it because you have too little information.
2006-06-16 16:26:24 · answer #3 · answered by friscoboy 2 · 0⤊ 0⤋
f(12)=16
if not........
:(
i will tell u again ;)
2006-06-16 10:51:33 · answer #4 · answered by sarah m 4 · 0⤊ 0⤋