The consumer's budget constraint (with Good 2 on the horizontal axis) is a line, which intersects vertical axis at 100/20 = 5 units of Good 1 and horizontal axis at 100/5 = 20 units of Good 2.
The budget constraint equation is 20Q1 + 5Q2 = 100, or Q1 = 5 - 0.25Q2, so the slope is -0.25.
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