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abelxoconda
16.01.2020 •
Mathematics
Question 2 (essay worth 10 points)
(08.02 mc)
a pair of equations is shown below:
y = 7x − 9
y = 3x − 1
part a: in your own words, explain how you can solve the pair of equations graphically. write the slope and y-intercept for each equation that you will plot on the graph to solve the equations. (6 points)
part b: what is the solution to the pair of equations? (4 points)
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Ответ:
The slope-intercept form of a line is:
y=mx+b, where m is the slope and b=y-intercept (value of y when x=0)
y=7x-9, slope=7, y-intercept is (0, -9)
y=3x-1, slope=3, y-intercept is (0, -1)
Part B
If a solution exists, the coordinates of each equation are the same, so we can say y=y, which means:
7x-9=3x-1 add 9 to both sides
7x=3x+8 subtract 3x from both sides
4x=8 divide both sides by 4
x=2, now you can use either original equation to solve for the corresponding value of y...
y=3x-1 becomes:
y=3(2)-1
y=6-1
y=5
So the solution to the system of equations is the point (2, 5)
Ответ:
the answer for hard cover books is 495 for 30 hard cover books
Step-by-step explanation:
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