Question

16. 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:

Step-by-step explanation:

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) 4(1)-3(2)+5

4-6+5

=3

ii) 1^2+2^2

1+4=5

iii) 1*2+3(2)-9

2+6-9

=(-1)

iv) 2(1)-2

2-2

=0