Solve the following simultaneous equation for x and y: 2x + 5y = 8, 4x + y = 7
Equation A: 2x + 5y = 8
Equation B: 4x + y = 7
2A: 4x + 10y = 16
2A - B: 9y = 9, Therefore y = 1
Sub y back into equation A to find x: 2x + 5 = 8, 2x = 3, x = 1.5
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All answers ▸Vectors a and b are defined by a = 2i + 3j and b = 4i - 2j, find 3a-b in terms of i and j
