Question

3,4=11 9,6=64 12,8=63 12,10=??

Answer 1

Let f(x,y)=ax+by+c

63=12a+8b+c ( we got this from equation 1)

11=3a+4b+c (we got this from equation 2)

64=9a+6b+c ( we got this from equation 3)

When we solve all 3 equations in terms of a,b,c we will get this:

a = 18,

b = − 27.5,

c = 67

f (x,y) = 18 x − 27 . 5 y + 67

f(10,12)=18(10)−27.5(12)+67

f(10,12)=180–330+67

f(10,12)=−113