Q. A line has a slope of 3 and includes the points (−5,j) and (−7,−4). What is the value of j?j=___
Use Slope Formula: To find the value of j, we can use the slope formula, which is x2−x1y2−y1=slope, where (x1,y1) and (x2,y2) are the coordinates of two points on the line.
Plug in Values: We know the slope of the line is 3, and we have the coordinates of one point (−7,−4). We can plug these values into the slope formula along with the coordinates of the second point (−5,j) to find j.
Simplify Equation: Using the slope formula: (j−(−4))/(−5−(−7))=3. This simplifies to (j+4)/2=3.
Eliminate Denominator: To solve for j, we multiply both sides of the equation by 2 to get rid of the denominator: 2×(2j+4)=2×3.
Isolate Variable: This simplifies to j+4=6. Now, we just need to subtract 4 from both sides to solve for j.
Final Calculation: Subtracting 4 from both sides gives us j=6−4.
Find Value of j: Calculating the difference, we find that j=2.
More problems from Find a missing coordinate using slope