Suppose the value of yy and the value of xx vary together at a constant rate of change (so that Δy=0.75⋅Δx), and y=1.5 when x=3.
Suppose the value of xx varies from x=3 to x=6.75.
How much did the value of x change?
Δx=
How much did the value of y change over this interval of x?
Δy=
What is the value of y when x=6.75?
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