Solve :
0.04x + 0.02y = 5and 0.5(x - 2) - 0.4y = 29
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Solve:
ax + by = a - bbx - ay = a + b
ax + by = cbx + ay = 1 + c
The expression ax + by has value 7 when x = 2 and y = 1. It has value 1 when x = -1 and y = 1. Find a and b.