SOLUTION: Please solve Using Substitution:
{{{7s+5t=13}}}
{{{3t-s=-13}}}
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Question 243956: Please solve Using Substitution:
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
Please solve Using Substitution:
7s+5t=13
3t-s=-13
solve second for s
add 13 and s to both sides
3t+13=s
substitute s into first
7* (3t+13)+5t=13
21t+7*13+5t=13
combine
26t+7*13=13
divide by 13
2t+7=1
subtract 7 from both sides
2t=-6
t=-3
substitute t into second equation
why second?
it is easier to multiply and divide
3*(-3)-s=-13
-9-s=-13
multiply both sides by -1
9+S=13
s=4
and t=-3
check
7s+5t=13
7*4+5*(-3)=13
28-15=13
13=13
ok
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