Since adding 2 tickets increases the cost by $28, tickets must cost $14 each. The only logical choice is thus (C).
Check: 14*4+7 = 56+7=63 and 14*6+7=84+7=91
This is exactly the same problem, just different numbers. Increasing the days by 4 raises the cost by $80,meaning $20/day. Choice (A)
The slope between two points is m=∆y/∆x where ∆ means "change in"
So, the slope between (x,y) and any point on the line is the same value: -3.
In particular, the slop between (x,y) and (-2,3) is -3. Symbolically, that is
(y-3)/(x+2) = -3
or, (y-3) = -3(x+2)
This one starts the same way, getting you to:
However, they asked for the slope-intercept form, y=mx+b. So, solve for y:
Division by 0 is not defined, so 3/x is not defined when x=0.
So, choice (A)
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