exam Maths Puzzle Numerical Ability

is (-1,2) a solution of y= 1/2x-1?

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exam Other Question

Sorry, but I have one more question on the substitution method. It is a+b=5000 and 0.08a=0.06b-20 THANKS ALOT Find an equatioin in standard form of the line having slope m and y-intercept b

m = 1/2, b = 3/2