Homework Help Forum: Algebra

Posted by Anneliese on Monday, November 2, 2009 at 3:55pm.

f(2)=5 f(-2)=1, I have to write the linear function for this. I got 5-1/2- -2=4/4=1 then I plugged it in so it would be y-5=1(x+2) which became y=x+7, then f(x)=x+7. The answer key, however, says f(x)=x+3. What did I do wrong?

• Algebra - bobpursley, Monday, November 2, 2009 at 4:39pm

  I have no idea what you did. y=mx+b 5=m2+b b=5-2m and y=mx+b 1=m(-2)+b b=1+2m setting the b=b 5-2m=1+2m 4m=4 m=1 then b=5-2m or b=3 y=x+3

  
  

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