5x+ 7y = 108 and 3x-y =20
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Step-by-step explanation:
- 5x+7y=180 -1
taking EQ 1
5x=180 - 7y
x = 180 - 7 y/5 - EQ 3
put x value in EQ 2
3( 180-7y/5) - y = 20
540 - 7y - y = 20 × 5
- 8 y = 100 - 540
- 8y = - 440
+8y = + 440
y = 440 / 8
y = 55
put value of y in EQ 3
x = 180 - 7y /5
180 - 7× 55 / 5
180 - 385 / 5
- 205 / 5
x = - 41
mark brainely
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