Answer:
a = -5
b = 2
Explanation:
a + b = -3
a - b = -7 Add together
2a = -10 Divide both sides by 2
a = -5
Use either of the two original equations to find b.
a + b = -3 Substitute -5 for a
-5 + b = -3 Add 5 to both sides
-5 + 5 +b = -3 + 5
b = 2
Check:
a + b = -3
-5 + 2 = -3
-3 = -3 Checks
a - b = -7
-5 - 2 = -7
-7 = -7 Checks