Question

If x=1,y=2,Find the values of the following expressions i)4x-3y+5 ii)x²+y² iii)xy+3y-9 iv)2x-y​

Answer 1

Answer:

Given x=1,y=2

(i) 4x−3y+5=4(1)−3(2)+5=4−6+5=3

(ii) x

2

+y

2

=(1)

2

+(2)

2

=1+4=5

(iii) xy+3y−9=(1)(2)+3(1)−9=2+3−9=−4

Answer 2

Step-by-step explanation:

(i) 4x−3y+5=4(1)−3(2)+5=4−6+5=3

(ii) x 2+y2

=(1) 2 +(2)2=1+4=5

(iii) xy+3y−9=(1)(2)+3(1)−9=2+3−9=−4

4 ) 2x-y = 2(1)-2

=2-2= 0