exam Maths Puzzle Numerical Ability

Please help me solve this system of linear equations : 2x-10y=1
3x-15y=4

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exam Other Question

The graph of the relation x^2 - 4y^2 + 2x - 8y - 10 = 0 is a (an)

a. point
b. straight line
c. pair of intersecting straight lines
d. circle
e. ellipse
f. hyperbola
g. parabola
h. none of these
Find the maximum value of C = x + 3y on the region determined by the constraints
{3x + 2y <= 16
{0<= x <= 4
{0<= y <= 5

Possible answers:

10
17
19
21