-2.2 + 0.3z= 3 -0.5z -0.8z what does z equal
2 answers:
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To construct the equations for these lines, we are going to use the point-slope formula, which is:
is the slope of the line
is a point on the line
1)
In this case, our point is (2, -1) and our line has a slope of 5. (Remember that the line is parallel, meaning that it has the same slope as the given line. Since the line is in the y = mx + b format, we could easily pick out the slope m as being 5.)
Thus, we can "plug in" what we know into our formula to find the equation of our line:
2)
We are going to do the same thing, except our point is now (0, -5) and our slope is now 9.
Our equations are:
1) y = 5x - 11
2) y = 9x - 5
The cost is the cost per pound times the number of pounds minus the coupon.
If pounds are purchased, she will pay
.
If 3 pounds are purchased, she will pay 3.50(3)-3.25=7.25.