exam Maths Puzzle Numerical Ability

Solve for x and y

6x-3y=9

5x+2y=-15

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exam Other Question

I need some help with this. I don't know where to begin...

Graph the following equations; calculate the slope, x-intercept, and y-intercept, and label the intercepts on the gra Okay this is a long one.
Q: Use the gauss jordon method to solve the system.
[1 5 -1 -4
0 3 -1 -1
-3 6 2 11] I started out by doing the gaussian method so this is