Please help I'll do anything solve the system of equations by using substitution

y = 2x+3
x - y= -2​

(x, y) = (-1, 1)

Step-by-step explanation:

y = 2x + 3

x - y = -2 since y is equal to 2x + 3 we replace the y in the second equation with 2x + 3

x - (2x + 3) = -2 add like terms

-x - 3 = -2 add 3 to both sides

-x = 1 and x = -1

to calculate value of y we replace x with -1

y = 2x + 3

y = 2 (-1) + 3 and y = 1

(x, y) = (-1, 1)

y = 2x + 3

x - y = -2 since y is equal to 2x + 3 we replace the y in the second equation with 2x + 3

x - (2x + 3) = -2 add like terms

-x - 3 = -2 add 3 to both sides

-x = 1 and x = -1

to calculate value of y we replace x with -1

y = 2x + 3

y = 2 (-1) + 3 and y = 1

step-by-step explanation:

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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)