The points (j, -1) and (7, 8) fall on a line with a slope of 9/10. What is the value of j?
The points (j, -1) and (7, 8) fall on a line with a slope of 9/10. What is the value of j?
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info@snapandsolve.comThe slope formula is m = (y2 - y1) / (x2 - x1). Here, m = 9/10, (x1, y1) = (j, -1), and (x2, y2) = (7, 8).
Substitute the values into the slope formula:
9/10 = (8 - (-1)) / (7 - j)
Simplify the equation:
9/10 = 9 / (7 - j)
Cross-multiply to solve for j:
9 * (7 - j) = 90
Expand and solve:
63 - 9j = 90
-9j = 90 - 63
-9j = 27
j = -3
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