exam Maths Puzzle Numerical Ability

Solve each of the following by graphing
x-y=4
2x-2x=8

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exam Other Question

evaluate the function for the value specified.

f(x)=xsec.power-7x+10; find (a)f(0),(b)f(5), and (c)f(-2)

I am really confused on this one. Thanks When the constraint 6x lower case 1+17x lower case 2 < or equal to 28 is converted to an equation, the equation is: