Question

Help me !!


If the point (a, 7) lies on the graph of the equation 5x - y = 8, then a=

-3
3
1/5

Answer 1

Im just think that its 3
but im not sure.

Answer 2

Ordered pairs are of the form (x, y) so if y is 7, what is x?

Answer 3

unknown

Answer 4

Plug y = 7 into your equation, 5x - y = 8 and solve for x

Answer 5

a is the x-coordinate or that point

Answer 6

What?

Answer 7

a in (a, 7) is the x-coordinate, and 7 is the y-coordinate. So if you plug in y = 7 into 5x - y = 8 then you can solve for a

Answer 8

its 3

Answer 9

Yup :)

Answer 10

Thank you (: