Question

Find y if the line through (3, 1) and (9, y) has a slope of 4.

Answer 1

Answer:

y = 25

Step-by-step explanation:

To find slope, we use this expression: $\frac{y2-y1}{x2-x1}$

Since we already know the slope and are trying to figure out a y-value, we can input all of the values we do know in the expression and solve for the missing y.

$\frac{y-1}{9-3}$=4

Simplify the denominator:  $\frac{y-1}{6}$=4

Multiply both sides by 6 to isolate the y - 1:   y - 1 = 24

Add 1 to both sides to isolate the y:  y = 25

y = 25