If f(x)= 5x+40 what is f(x) when x =-5
2 answers:
<span>If f(x)= 5x+40 what is f(x) when x =-5
</span>
---f(x)= 15
Answer:
f(-5) = 15
Step-by-step explanation:
f(x) is a straight line with a y-intercept of f(0) = y = 40 and a x-intercept of x = -40/5 = -8.
With x = -5 and substituting it into f(x) the following occurs:
f(-5) = 5×(-5) + 40 = -25 +40 = 15
∴ When x=-5, y will be 15 and the new coordinates will be a point on the like with (-5, 15).
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