The solution on the graph is (x,y)=(7,25), so x=7.
[tex]a. \\
3x+4=5x-10 \\
3x-5x=-10-4 \\
-2x=-14 \\
x=\frac{-14}{-2} \\
x=7 \\ \\
b. \\
3x-4=5x-10 \\
3x-5x=-10+4 \\
-2x=-6 \\
x=\frac{-6}{-2} \\
x=3 \\ \\ c. \\
3x+4=5x+10 \\
3x-5x=10-4 \\
-2x=6 \\
x=\frac{6}{-2} \\
x=-3 \\ \\
d. \\
3x-4=5x+10 \\
3x-5x=10+4 \\
-2x=14 \\
x=\frac{14}{-2} \\
x=-7[/tex]
x=7 in the equation a, so the answer is A.