# 21) The line y is equal to is a tangent to the curve if the value of m is (A) 1(B) 2(C) 3(D)1/2

Standard equation of the straight line
y = mx + c
Where m is lope and c is constant
By comparing it with equation , y = mx + 1
We find that m is the slope
Now,
we know that the slope of the tangent at a given point on the curve is given by Given the equation of the curve is  Put this value of m in the given equation  Hence, value of m is 1

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