Question

Check my answer

Answer 1

Question;;;

Answer 2

Solve the system of equations using linear combination?
a + c = 9
8a + 4.5c = 58

Answer 3

My answer;;;

Answer 4

a + c = 9, or
c = 9 - a = Equation 1

8a + 4.5c = 58 = Equation 2

Subbing (9 - a) from Eqation 1
for c in Equation 2

8a + 4.5(9 - a) = 58
8a + 40.5 - 4.5a = 58
3.5a = 58 - 40.5
3.5a = 17.5
a = 17.5 / 3.5
a = 5

Subbing 5 for a in Equation 1,

c = 9 - 5
c = 4

Solution: a = 5 and c = 4

Answer 5

\(\huge\color{purple}{GOOD~JOB}\)

Answer 6

:)

Answer 7

you can also check by plugging back a and c values

Answer 8

like this so a is 5 and c is 4
both side equal so yes that is right