book Maths Puzzle Numerical Ability

-2x+y=6
4x-2y=5

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if f(x)=3x+2 find f(6) and f(-2) i need to graph the equation x= -4 and also to change a temperature from degrees Fahrenheit to degrees Celsius, use the formula C=5/9 (F-32). Find the F and C intercepts of the lin