Galena is solving the following system.
see picture !
step 1: she multiplies equation (3) by 3 and adds it to equation (1).
step 2: she multiplies equation (3) by –7 and adds it to equation (2).
which statement explains galena’s mistake?
a)she added equation (1) instead of equation (2) in step 1.
b)she did not multiply equation (3) in step 1 by the correct value.
c)she did not multiply equation (3) in step 2 by the correct value.
d)she added equation (2) instead of equation (1) in step 2.