Solve the equation -5x + 7 = 42.
7
-7
21
-21
2007-09-19 06:08:58 · 8 answers · asked by kaylee826 1 in Education & Reference ➔ Homework Help
Combine like terms and use the properties of equality to get the variable on one side of the equals sign and the numbers on the other side.
(-5)x+7=42
Subtract 7 from both sides of the equation
(-5)x = 35
Divide both sides of the equation by -5
x= -7
The answer is -7
2007-09-19 06:17:26 · answer #1 · answered by Anonymous · 0⤊ 0⤋
X= -7
2007-09-19 06:14:50 · answer #2 · answered by alicia 2 · 0⤊ 0⤋
-5x + 7 = 42
Subtract the 7 from both sides
-5x + 7 – 7 = 42 – 7
-5x = 35
Divide 35 by -5
-5x/-5 = 35/-5
x = -7
Good luck and hope this helps!
2007-09-19 06:16:37 · answer #3 · answered by sam88keys 2 · 0⤊ 0⤋
the answer is MINUS SEVEN
substitute each of the values for x and see if the expression is true;
in this case -5(-7) +7=42
minus times a minus is a PLUS, so
PLUS 35 plus 7=42 ? yes it does, now check the others to prove only one answer is correct:
for value 7, it equals -35+7=MINUS 28
for value 21 it equals -105+7=MINUS 98
for value -21 it equals 105+7=PLUS 112
2007-09-19 06:19:24 · answer #4 · answered by Mike 7 · 0⤊ 0⤋
-7:
-5x+7=42
-5x=35
-7=x
2007-09-19 06:14:09 · answer #5 · answered by Matt W 2 · 0⤊ 0⤋
-5x+7=42 (given)
-7 -7
-5x=35
/-5 /-5
x=-7
so x=-7
2007-09-19 07:03:51 · answer #6 · answered by Daniel K 2 · 0⤊ 0⤋
-7.
2007-09-19 06:16:22 · answer #7 · answered by njskiier33 2 · 0⤊ 0⤋
-5x = 35
x = -7
2007-09-19 06:16:38 · answer #8 · answered by Anonymous · 0⤊ 0⤋