Math equation for school

Question

2a+10b-c and -3a+5b+c can somone please solve these equations

Answer 1

2a + 10b - c =0

-3a +5b + c =0

add

-a +15b = 0

a = 15b

c = 3a-5b = 45b-5b = 40b

c = 40b

or

c = 3a-5a/15 = 3a-a/3 = 8a/3

c = 8a/3

b = a/15

or

b = (3c/8)/15 = (c/8)/5

b = c/40

with only 2 equations and 3 unknown variables there is no unique solution

but you can solve each of the 3 variables in terms of the other 2 variables

there are an infinite number of solutions in terms of real numbers