exam Maths Puzzle Numerical Ability

Solve by substitution or elimination:
x=3y+11
2x+5y=0
I dont understand could I please have help for this question?

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exam Other Question

simplify as best as possible.

(2+squareroot of 7)(9+squareroot of 7)
Solve each system of inequalities by graphing.

1. 2x - y >5
3x + y <4

2. x is greater than or equal to 0.
y is less than or equal to 6
y is less than or equal to