exam Maths Puzzle Numerical Ability

Write the linear equation in slope-intercept form;: -3x-4y-19=0

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factor:

x^2+2x+1

thanks please help me in this problem
for each of the following find constant c so that f(X) satisfies the condition of being apdf of one random variable x
1.f(X)=c(2/3)^x , x=1,2,3,...., zero elsewhere.
2.f(X)=cx, x=1,2,3,4,5,6 , zero elsewhere