Step-by-step explanation:
3x + 5y = 21 * (-4) •••••• -12x -20y = -84 (a)
4x - 2y = -24 * (3) •••••• 12x -6y = -72 (b)
(a) + (b)
-26y = -156
y = 6
3x + 5 * 6 = 21
3x = 21 - 30
3x = -9
x = -3
Answer: a=1.4
Step-by-step explanation:
move the 0.1a to the other and the 7 to the other side which will make the 7 positive and the 0.1a negative.
5a-0.1= 4.9a
-0.14+7=6.86
dive both sides by 4.9 and you get
a=1.4
Answer:
b
Step-by-step explanation:
Answer: x={0,3}
x(x-3)=0
x=0, x-3=0
x=0, x=3
x={0,3}
The standard form:
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<em>use distributive property</em>
<em>multiply both sides by 8</em>
<em>add 2x to both sides</em>
<em>add 8 to both sides</em>
