Question

When the point (3,k) lies on each of these lines, find the value of k.

a) y=3x+2
b) y=4x-2
c) y=3-2x
d) x+y=7
e) x-2y=1
If you answer you don't have to explain but please do

Answer 1

Answers:
a) k=11
b) k=10
c) k=-3
d) k=4
e) k=1

I do not mind explaining

For the point (3,k) and virtually every point, 3 is the x coordinate and k is the y coordinate. Therefore, we can substitute 3 for x and solve for k (which is y).

a) 3(3)+2=11

b) 4(3)-2=10

c) 3-2(3)=3-6=-3

d) 3+4=7

e) 3-2(1)=1