Question

The x-coordinate of the point of intersection of the straight lines 2x+ay-7=0 and ax-y-5=0 is 2. If a is an integer, find the value of a.

Answer 1

2x+ay-7=0 -(1)
ax-y-5=0 -(2)

From the second equation:
y = ax-5 -(3)

Sub. (3) into (1)
2x+a(ax-5)-7=0 -(4)

Sub x=2 into (4), then solve a

I think it should work.

Answer 2

is it 3?

Answer 3

thank you I got it:)

Answer 4

I think so!