Question

There's a pair of points (3,5), (x,15) and a slope of 2 how do I find x​

Answer 1

x =7

Explanation:

slope m = ( y2-y1) / (x2-x1)

for points (3,5) and (x,15)

that will be m= (5-15)/(3-x)

so (5-15)/(3-x) =2

-10 / (3-x) = 2 / 1 cross multiply

-10 = 2(3-x) divide both sides by 2

-5 = 3 -x

x= 3+5 =8

Answer 2

You have the slope and you have two points, so you can use the slope equation to find x.

`b=((y_2-y_1))/((x_2-x_1)) \\2=((15-5))/((x-3)) \\2(x-3)=(15-5)\\2x-6=10\\2x=16\\x=8`

So your answer is x = 8.