exam Maths Puzzle Numerical Ability

A defence attorney charges her client $4000 plus $120 per hour. The formula R = 120n + 4000 gives her revenue in dollars for n hour of work. What is her revenue for 100 hours of w

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could u please help me withthe expression if x=2,y=4.2,andz=0.7
y xyz
- and
x
thank you use graphing to find the solutions of the system
y-x=6
y+2x=-6