(x + 10)/2 = (x - 6)/x.
Multiply both sides by 2x to produce:
x2 + 10x = 2x - 12
Rearrange and collect like terms to produce:
x2 + 8x + 12 = 0
Factoring produces:
(x + 6)(x + 2) = 0, which is true whenever x = -6 or x = -2
Check: for x - -6: (-6 + 10)/2 = 2; (-6 - 6)/-6 = -12/-6 = 2
(-2 + 10)2 = 4; (-2 - 6)/-2 = -8/-2 = 4.
x/5 = 3 Multiply both sides by 5 to find the value of x:- x = 15
it equals x1 it equals x1
Secant is 1 over cosine and cosine 0 equals 1.
-2, 3
1 Any number over itself equals to one
Easy. Cross multiply to get 2x = 35. Then, divide by two to get 35/2.
cross multiply 3/6=y/10 30=6y y=5
x=3 cross multiply and you get 15x=45 then divide 45 by 15 and you get 3
You just do 120 over 3 equals x over 5 and cross multiply. You get 3x equals 600. You multiply 3x from both sides and get x=200.
"Is" over "of" equals "percent sign" over "one hundred." X/119.93=20/100 Cross multiply. 100x=2398.6 x=23.986
"Is" over "of" equals "percent sign" over "100." x/44=40/100 cross multiply 100x=40*44 100x=1760 x=17.6
10.515% of 70: put n over 70 equals 15 over 100n ----------15--- equals ---- then cross multiply n x 100 and 15 x 7070---------100which would be 100n and 1050then divide100n --------1050------ equals ------- n equals 10.5%100 -----------100
q/31 = 3 q/31 = 3/1 Cross Multiply: 1q = 31(3) q = 93
To do this, you have to cross multiply. (It helps if you write this down on paper as you read). So, 3 over 8 = n (unknown number) over 56. Then you use a trick called cross multiplication. You just multiply the numbers diagonal from each other and your equation equals 3x56=8n. Get it? When you multiply 3 and 56, you get 168=8n. From here, you divide both sides by 8 to get what n equals. 168/8=8n/8. When you divide 168 and 8, you get 21. So, n=21. 3 eighths of 56 equals 21! :)
z/6 = -5/12, cross multiply. z*12 =-5*6 z = -30/12 z= -5/2
1
To divide fractions, turn the second one over - that is, swap its numerator and denominator - and multiply. Nothing else is necessary. You cross multiply when you have a proportion, that is when you have two ratios that are equal.