# Math ~ Check Answers ~

Explain how to write a function rule from the table below. Then write a function rule.

X: 2 | 4| 6 |
And: 1 | 0 | -1 |

y = -1/2 x

But, -1/2 (2) = -1, and y(2) = 1, so we need to add 2 at the start. So,

y = 2 - 1/2 x

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1. y = mx + b
f(x) = 2m + b = 1
f(x) = 4m + b = 0
f(x) = 6m + b = -1

-1(2m + b = 1)
4m + b = 0

-2m -b = -1
4m + b = 0

2m = -1
m = -1/2
2(-1/2) + b = 1
-1 + b = 1
-1+ 1 + b = 1 + 1
b = 2
y = mx +b
y = -1/2x + 2

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posted by Chloé
2. Help Is It Like This Which one the top or the bottom one!!! help check my answers

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posted by Chloé
3. use the first pair of points (2,1) and (4,0)
slope = -1/2

so y = mx + b ----> y = -(1/2)x + b
sub in (4,0)
0 = (-1/2)(4) + b
b = 2

y = (-1/2)x + 2

use our non-used point to check:
does (6,-1) lie on it?

LS = -1
RS = (-1/2)(6) + 2
= -3+2
= -1

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posted by Reiny
4. Thanks

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posted by Chloé
5. X | 0 | 1 | 2 | 3 | 4 |
Y | 47 | 43 | 39 | 35 | 31 |

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posted by Angel

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