exam Maths Puzzle Numerical Ability

I THINK that this is a linear equation problem. Can you help me solve this? I don't know how to solve for multiple variables in this way:
{{{2x+2z=2}}}

{{{5x+3y=4}}}

{{{3

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exam Other Question

Express the following Rational expressions in lowest terms :

1). x/x+xy

2). 3x^2+6x / 3x^2 +9x

3). x^2+2x+1 / x + 1

4). 4x^2-12x-40 / 2x^2-16x+30 Alana makes $5.80 per hour working in the library. To keep her job, she must make are least $116. per week; but to keep her scholarship, she must not earn more than $145. per week. What is the range of the number of hours per week she must work?