Please help me to solve this question using substitution method. Thank you.
x/2+y/3=7
x/4-y/9=1
2007-09-04 11:59:35 · 4 answers · asked by AnswerGirl 2 in Science & Mathematics ➔ Mathematics
solve for X and Y
2007-09-04 12:00:14 · update #1
multiply up
3x + 2y = 6*7 = 42
2y = 42 -3x
9x - 4y =36 = 9x - 2(42 - 3x) = 9x -84 + 6x = 15x - 84
15x = 120
x = 8
y = 9
2007-09-04 12:10:35 · answer #1 · answered by Beardo 7 · 0⤊ 0⤋
Solve for x in x/2+y/3=7.
plug in the value of x in x/4-y/9=1.
Then u know what to do.
2007-09-04 19:05:54 · answer #2 · answered by Legend 3 · 0⤊ 0⤋
1. Multiply the top equation by 6, then multiply the bottom equation by 36.
***3x + 2y = 42
***9x + 4y = 36
2. Solve the top equation for Y.
3. Substitute new equation (solved for Y) into bottom equation. (X should come out to be -16).
4. Substitute the answer for X into one of the ORIGINAL EQUATIONS. (Y should, eventually, come out to be 45).
5. Plug both values back in and check both equations.
2007-09-04 19:17:55 · answer #3 · answered by owlprowler77 2 · 0⤊ 0⤋
Fractions??? BAH. this isn't simple!!
2007-09-04 19:04:32 · answer #4 · answered by steve b 2 · 0⤊ 0⤋