exam Maths Puzzle Numerical Ability

1.find the slope of each line that has a slope
A)the x-axis
B)y=-4

2.find an eq. in slope -intercept form where possible
C)x-intercept-2, y-intercept4
D)thru (-1,4), paralle

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exam Other Question

Help I cannot get this :)
Find values for m and b in the following system so that the solution to the system
is (3, 4).
5x+7y=b
mx+y=22 Stock X has a 10% expected return, a beta coefficient of 0.9, and a 35% standard deviation of expected returns. Stock Y has a 12.5% expecter return, a beta coefficient of 1.2, and