a + b = -1
a - b = 5
a = -1 - b
Substitute:
-1 - b - b = 5
-2b = 6
b = -3
a - 3 = -1
a = 2
Find two numbers a and b whose sum a+b is -1 and whose difference a−b is 5.
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2 answers
a = b + 5
a + b = -1
Substitute b+5 for a in the second equation and solve for b. Insert that value into the first equation to solve for a. Check by putting both values into the second equation.
a + b = -1
Substitute b+5 for a in the second equation and solve for b. Insert that value into the first equation to solve for a. Check by putting both values into the second equation.