- x+y=342 x-y=240 3/4:5=36
x+y+x-y=2x=342-36=306 x=306/2=153
y=342-153=189
2.x+y=115 115+3+7=125 x+3/y+7=2/3 125/2+3=25
y+7=3*25=75 x+3=2*25=50
y=68 x=47
3. x+y+z=1324 1324-47+134-71=1340
(x-47):(y+134):(z-71)=3:5:2 3+5+2=10 1340/10=134
x-47=3*134=402 y+134=5*134 z-71=2*134=268
x=402+47=449 y=670-134=536 z=268+71=339
4.
{x-6a-4b=270
{x-8a-5b=210
x=270+4b+6a
270+4b+6a-8a-5b=210
-b-2a=210-270=-60
b+2a=60
b=60-2a
270+4*(60-2a)+ba-8a-5*(60-2a)=210
270+240-8a+6a-8a-100-10a=210
-8a+6a-10a=210-270-240+400-20a=0
a=0
b=60-0=60
x=270+240+0=510
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