Simultaneous Equations
2u + b = $110
4u + 3b = $268
(x2) 4u + 2b = $220
(x1) 4u + 3b = $268
<em />If both the matching coefficients are the same, we subtract equation 2 from equation 1
2b - 3b = -b
$220 - $268 = $-48
-b = -$48
b = $48
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Substitute b = $48 into the first equation
2u + $48 = $110
Balance the equation, whatever happens on one side, happens on the other.
2u + $48 (-$48) = $110 (-$48)
2u = $62
2u(/2) = $62(/2)
u = $31
5x-7
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B. -4x + 7 = -5(x - 10)
-4x + 7 = -5x - 50
<u> +5x +5x </u>.
x + 7 = -50
<u> -7 -7</u>
x = -57
Answer:
1
Step-by-step explanation:
