Find the value of x+y and x-y without actually solving for x and y. 4x +3y=17 ; 3x+4y =25
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Step-by-step explanation:
4x+3y=17 ..........( i )
3x+4y=25 ...........( ii )
4x+3y=17. ×3
3x+4y=25. ×4
_____________
12x+9y=51
12x+16y=100
(-). (-). (-)
____________
-7y=-49
y=-49/-7
y=7
substitute y=7 in equ ( i )
4x+3y=17
4x+3(7)=17
4x+21=17
4x=17-21
x=-4/4
x=-1
x=-1 , y=7
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