exam Maths Puzzle Numerical Ability

Allen bought 21 stamps in 37-cent and 20-cent denominations. If the total cost of the stamps was $7.26, how many 37-cent stamps did Allen buy?

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exam Other Question

w+3x-y+2z =-4
w-2x+3y+5z=-3
3w+2x+y+z=9
2w-x+2y+z=7

I need to know what w,x,y,and z
Please help me Im so lost. How do you convert a point intercept formula to standard and vice versa.