If you are trying to eliminate the y, then both of the numbers in front of the y have to be the same, but one needs to be negative and the other positive.
The easiest way to do this is multiply the top equation by 3, so you'd get -6y for the top and you could cancel it out with the +6y on the bottom.
D. Multiply the top equation by 3.
Answer:
Step-by-step explanation:
20x - 44z = 84
528x + 44z = 1012
548x = 1096
x= 2
48(2) + 4z = 92
96 + 4z = 92
4z = -4
z = -1
(2, -1)
When it's laid out like that. 2 division statements on either side with one unknown variable you just cross multiply really easy
5 x 24 / 6 = 20
Take the number that's on the same position of the x thats 5 then multiply it to the numerator or denominator of the x thats 24 then divide it to its denominator thats 6
N=30°. The sum of the angles is 180º. n+n+4n=6n, so 6n=180 and n=30°.
n=18°. 4n+n=90, so 5n=90, n=18°.
