exam Maths Puzzle Numerical Ability

I need help in solving the question:SOLVE THE LINEAR SYSTEM BY GRAPHING:
Y=3x + y
y=x-2

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exam Other Question

My answer to the problem stated below 1/10 = 0.1 Am I correct?

Problem:
A couple plans to have 4 children.Assuming the probability of obtaining each sex is 50% (1 in 2), find the probability of the couple getting 4 boys. State the degree & end behavior of the function:
f(x)=(x+3)^6(x+1)(x-5)^7

a). degree 14, up/up
b). degree 13, down/up
c). degree 14, down/up
d). degree 13, up/up