Question

a) {x+y= 360
{x-y=140



b) {X+Y=43
{X-Y=29

Answer 1

x+x+y-y= 360+140
2x= 360+140
x= 500/2
x= 250

250+y= 360
y=360-250
y= 110

250+110= 360
250-110= 140



x+y= 43
x-y= 29

x+x+y-y= 43+29
2x= 72
x= 72/2
x= 36

36+y= 43
y= 43-36
y= 7