wahaby: 5 kg of apples cost £7
2kg of apples and 3kg of bananas cost £5.65
work out the cost of 1 kg bananas
a: cost of 1kg of apples
b: cost of 1kg of bananas
searched: b = work out the cost of 1 kg bananas
equation1:
5*a = 7 equation2:
2*a + 3*b = 5.65
[input]solve( 5*a = 7, 2*a + 3*b = 5.65 )[/input]
{a=1.4, b=0.95}
wahaby: work out the cost of 1 kg bananas
b=
£0.95 test: 5*a = 5*1.4 = 7
test: 2*a+3*b = 2*1.4+3*0.95 = 5.65
solve manually:
5*a = 7
a = 7/5
2*a + 3*b = 5.65
2*(7/5) + 3*b = 5.65
14/5 + 3*b = 5.65
14/5 + 3*b -14/5 = 5.65 - 14/5
3b = 2.85
b = 2.85 / 3 =
0.95
+3144 
