solve the following pair of linear equation 3 x minus Y is equal to 7 and 2x + 5y +1is equal to 90
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Answer:
(3x - y = 7)*2
(2x + 5y =89)*3
6x - 2y = 14
- 6x - 15y = -267
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-17y = -253
y = 14.88
3x - 14.88 = 7
3x = 21.88
X = 7.29 Y = 14.88
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Answered by
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Step-by-step explanation:
3x-y=7
2x+5y+1=90
multiply 2 with first one and 3 with second one
=6x-10y=24
=6x+15y+3=270
now on subtracting
-10y-15y-3=24-270
-25y-3=-246
25y=-246+3
25y=-243.
y=-243/25.
put the value of y in first one
6x-10×-243/25=0
6x=243×2/5
x=243×2/5÷6.
now solve you will get the answer
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