Question

WILL MEDAL!!!!

On which of the following lines does the point (7, 1) lie?

a. y-5x=4
b. y=x-10
c. y=-4x+3
d. y=-x+8

Answer 1

hey :)
A simple way to do this is just to substitute in your point (7, 1) into your equations.
For example for the first equation :
y - 5x = 4
You want to sub in x = 7 , y = 1
So,
1 - 4 ( 7) = 4
1 - 28 = 4
-27 = 4 is INCORRECT because they're not the same number :)
Therefore, (7,1) does not satisfy y - 5x = 4

Basically you follow the same pattern and substitute x = 7 , y = 1 into your equations until you have the LHS = RHS ^_^