if ×=1; y=2 find the values of the following expressions i) 4×-3y+5 ii) ×square 2 + y square 2 iii) ×y+3y-9
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(i) 4x-3y+5
=4×1-3×2+5
=4-6+5
=4-11
=-7
(ii) x^2+y^2
=(1)^2+2^2
=1+4
=5
(iii) xy+3y-9
=1×2+3×2-9
=2+6-9
=8-9
= -1
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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
(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
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