—5х + 13y = -7
5х + 4 = 24
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Step-by-step explanation:

Given:

We need to find the values of 'x' and 'y'.

On solving the equation we get;

Let

Also Let

Now Adding equation 1 and equation 2 we get;

Now By using Division property we will divide both side by 17 we get;

Now Substituting the value of y in equation 1 we get;

Now Subtracting both side by 13 using subtraction property we get;

Now By using Division property we will divide both side by -5 we get;

Hence

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

jml angle lkj & angle mj = lm