# SOLUTION: Can you tell and explain the equation of the line with given slope and y-intercept. Then graph each line using the slope and y-intercept. Slope: - 3/4; y-intercept: (0, 8)

Algebra ->  Algebra  -> Graphs -> SOLUTION: Can you tell and explain the equation of the line with given slope and y-intercept. Then graph each line using the slope and y-intercept. Slope: - 3/4; y-intercept: (0, 8)       Log On

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 Click here to see ALL problems on Graphs Question 78569: Can you tell and explain the equation of the line with given slope and y-intercept. Then graph each line using the slope and y-intercept. Slope: - 3/4; y-intercept: (0, 8) Answer by bucky(2189)   (Show Source): You can put this solution on YOUR website!Given the following information for an equation and its graph: . Slope: - 3/4; y-intercept: (0, 8) . The slope-intercept equation says that the equation is of the form: . y = mx + b . in which m is the slope and b is the point at which the graph crosses the y axis. . All you have to do now is to substitute the given values of the slope and y intercept into the slope intercept equation. When you make the two substitutions you get: . y = (-3/4)x + 8 . You already know one point on the graph. That point is (0, 8) the point at which the graph crosses the y-axis. You can plot that point by going +8 units up the y-axis and putting a dot there. . Now you can pick a convenient value for x, substitute it into the equation and find the corresponding value of y. Let's pick x = 4 and substitute it into the equation to get: . y = (-3/4)(4) + 8 . Multiply out (-3/4) times 4 and you get -3. This makes the equation become: . y = -3 + 8 . and adding the terms on the right you find that y = +5 when x = +4. Therefore, you know that (4, 5) is another point on the graph. . Just as a check, let's find one more point on the graph. Suppose we let x = 8 and substitute that value into the equation. If we do that we get: . y = (-3/4)*8 + 8 = -6 + 8 = +2 . Therefore, we know that when x = 8, y = 2 so the point (8, 2) should be on the graph. . Plot the three points (0, 8), (4, 5) and (8, 2) and draw a straight line that runs through all three of these points. That should be the graph and it should look somewhat like this: . . Hope this helps you to understand the problem and how to solve it.