book Maths Puzzle Numerical Ability

Im starting out with fourteen now i subtract 4 the Multiply by 7 then i have to make up how much at divide and add

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book Other Question

Please help me to: write an equation for a line through (2,2), y intercept 10. Thank you. please help me with this problem i have no idea how to get the answer and i have been working on it for an hour. solve the system of equations.
3x+4y+z=7
2y+z=3
-5x+3y+8z=-31
thank you!!!