exam Maths Puzzle Numerical Ability

Not understanding equations and slopes.

A line passing through (1,4) has a slope of m = 3. Another point on the same line is: a. (4,7)
b. (4,4)
c. (4,5)
d. (1,7)
Please explain.

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exam Other Question

A wallet contains $5 bills and $10 bills. There are 15 bills in the wallet with a total value of $120. Determine the number of $5bills and the number of $10 bills in the wallet. Solve for x:
a) (4^x)(2^(x+3)=16(^2x-5)
b) (2x-1)(^1/2)=sqrt3
c) 8(^2x)+(8^x)-12=0
d) (x+3)(^2/3)=4