So, look. It sorta depends on what the question is asking. Since I only have the equations, and not the question, I'll do my best.
Right, so, if you wanna know the slope and everything, the first equation
5x + 3y = 26 the slope and everything for it, it:
Slope = -3.333/2.000 = -1.667
x-intercept = 26/5 = 5.20000
y-intercept = 26/3 = 8.66667
And the second one 6x + 7y = 21:
Slope = -1.714/2.000 = -0.857
x-intercept = 21/6 = 7/2 = 3.50000
y-intercept = 21/7 = 3
Now, theres also where you just wanna find "x" and "y". Tell me which one you need to know. :)