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Eight times a number plus five times another number is -13 The sum of the numbers is 1 What are the numbers?
Wiki User
∙ 15y ago
let's denote the first number with x, and the second number with y. So,
8x + 5y = -13
x + y = 1
y = 1 - x substitute 1 - x for y at the first equation;
8x + 5(1 - x) = -13
8x + 5 - 5x = -13
3x + 5 = -13 subtract 5 to both sides;
3x = -18 divide by 3 to both sides;
x = -6
y = 1 - x substitute -6 for x ;
y = 1 -(-6)
y = 1 + 6 = 7
Thus the numbers are -6 and 7.
Check.
Wiki User
∙ 15y ago
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