Solve for a: 4a - 7 = 1
__________
2 2
A.) a = 3
B.) a = 1
C.) a = 4
D.) a = 2
2007-01-15 17:45:40 · 7 answers · asked by Bethanne s 1 in Science & Mathematics ➔ Mathematics
Add 7 to both sides:
4a - 7 + 7 = 1 + 7
4a = 8
Divide both sides by 4:
4a/4 = 8/4
a = 2
D.) a = 2
2007-01-15 17:48:37 · answer #1 · answered by cutest pooky 3 · 2⤊ 0⤋
4a - 7 = 1
=>4a = 1+7
=>4a = 8
=>a = 8/2
=>a = 4
so, the answer is D:a = 2.
2007-01-15 18:05:10 · answer #2 · answered by voldemort 1 · 0⤊ 0⤋
I'm not sure what the equation is. is it 4a-7=1 ? if so
add 7 to each side
4a=8 divide both sides by 4
a=2
D.) a = 2
or is it
(4a-7)/22=1 ? if so multiply both sides by 22
4a-7=22 add 7 to each side
4a=29 divide both sides by 4
a=7.25 which isn't on the list so I assume my 1st interpretation was correct.
2007-01-15 18:02:48 · answer #3 · answered by yupchagee 7 · 0⤊ 0⤋
switch 7 over to the other side makes 4a=8
your answer is D
2007-01-15 17:52:50 · answer #4 · answered by al.godnessmary 2 · 0⤊ 0⤋
Use rules of add/sub/div/mult.
Add 7 to both sides, which leaves 4a = 8
Divide both sides by 4, which leaves a = 2
Use the reverse of PEMDAS to undo equations.
2007-01-15 17:51:31 · answer #5 · answered by teachbio 5 · 0⤊ 0⤋
4a-7 = 1
add 7 to both sides
4a=8
divide both sides by 2
a=2
so D is the correct answer.
An alternative approach given that the test is multiple choice is to try each answer
A) 4x3-7 = 5 so not correct
B) 4x1-7 = -3 so not correct
C) 4x4-7= 9 so not correct
D) 2x4-7=1 so correct
2007-01-15 17:50:02 · answer #6 · answered by crazy_tentacle 3 · 0⤊ 2⤋
d) a=2
Multiply 4 x a then subtract 7.
The only one that fits is 8
2007-01-15 17:49:58 · answer #7 · answered by brandeeteer 2 · 0⤊ 1⤋