exam Maths Puzzle Numerical Ability

1)5x+2y=-17
x=3y

2)4x-y=9
2x=3y=-27

3)1/2x+3/4y=-1/4
3/4x-1/4y=1

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exam Other Question

find points on graph using the equation -x+2y=11
how do you find the point for the graph y varies jointly as a and b and inversely as the square root of c. y=48 when a=4, b=8 and c=36. Find y when a=2, b=7 and c=16.
a. 7.875
b. 31.5
c. 3.5
d. 504