3x + 2y = 7
y = -3x + 11
Solve the system of equation using substitution.
Substitute the y in the first equation by its value presented in the 2nd equation.
3x + 2y = 7
3x + 2(-3x + 11) = 7
3x - 6x + 22 = 7
-3x + 22 = 7
-3x = 7 - 22
-3x = -15
-3x/-3 = -15/-3
x = 5
Substitute x in the 2nd equation by its computed value. x = 5
y = -3x + 11
y = -3(5) + 11
y = -15 + 11
y = -4
x = 5 ; y = -4
Substitute x and y in the 1st equation with its corresponding values
3x + 2y = 7
3(5) + 2(-4) = 7
15 - 8 = 7
7 = 7
A. Eli's error was 3900-3867=33 kg.
B. A fairly small child would weigh about 33 kilograms.
C. Macy's percent error was .7/70=.01, or 1%. Eli's was 33/3900.0085, or .85%. Macy's percent error was larger, so Eli is more accurate.
Answer:
If DF is the angle bisector, that means that m∠ADF = m∠FDE so we can write:
9x - 1 = 8x + 3
x = 4°
4/5x-8=3
move -8 to the other side and add
4/5x=3+8
4/5x=11
move 5x to the other side and multiply
4=5x*11
4=55x
4/55=x