exam Maths Puzzle Numerical Ability

Please help me solve this one, I have worked on it for some time and cannot figure it out.

2x/9-5x/4=7/36

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exam Other Question

Solve by substitution or elimination:
x=3y+11
2x+5y=0
I dont understand could I please have help for this question? Find any intercepts. Then graph the linear equation.

y=3/5x-3