exam Maths Puzzle Numerical Ability

Pease help me get this answer for this mathe problem? I is on substition Algebra 1 x-y=10
5x-y=-6

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exam Other Question

solve:

x^2-y^2=4
x+y=1
FIND AN EXPONENTIAL FUNCTION OF THE FORM f(x)=ba^x+c WITH y-INTERCEPT 2, HORIZONTAL ASYMPTOTE y=-2, THAT PASSES THROUGH THE POINT P(1,4).