If f(x) = −2 + 8, what is f(−1.8)? 4 6 10 12
2 answers:
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Answer:
(x) =
Step-by-step explanation:
let y = - 8x + 4
rearrange making x the subject
add 8x to both sides
8x + y = 4 ( subtract y from both sides )
8x = 4 - y ( divide both sides by 8 )
x =
change y back into terms of x, then
(x) =
Answer:
B.
Step-by-step explanation:
{y = 2x - 3,5
{x -2y = −14
x - 2[2x - 3,5] = −14
x - 4x + 7 = −14
−3x + 7 = −14
- 7 - 7
__________
−3x = −21
___ ___
−3 −3
[Plug this back into both equations above to get the y-coordinate of 10,5];
* 10½ = 10,5
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