exam Maths Puzzle Numerical Ability

which of the points is on the line 3y-4x=7?

(-4,8)
(2,5)
(1,0)
(5,-2/3)

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exam Other Question

could somebody help, me please?
1)find the center and length of a radius of each circle

a) x^2+y^2+8x-12x+43=0
I tried. and got stuck
(x^2+8x)+(y^2-12y)=-43
(x^2+8x=43)^2 + (y^2-12y+12)^2=-43+43+12
then.... The lengths of the sides of a triangle are 7, 8 and 9 cm. Calculate the size of the smallest angle in the triangle (in degrees correct to 2 decimal places).