Answer: -7 is the answer.
Step-by-step explanation:
y2 - y1 = m (x2 - x1)
y - (-5) = -2 {x - (-1)} [Taking y2 as y and x2 as x]
y + 5 = -2 (x + 1)
y + 5 = -2x -2
y + 2x = -2 - 5
2x + y = -7
Answer:
see explanation
Step-by-step explanation:
Slope- intercept form is y = mx + c
Rearrange the given inequalities into this form
x + y ≤ 55 ( subtract x from both sides )
y ≤ - x + 55
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60x + 40y > 600 ( subtract 60x from both sides )
40y > - 60x + 600 ( divide all terms by 40 )
y > - x + 15
Answer:
Step-by-step explanation:
Given equation:
Multiply both sides by 3:
Multiply both sides by 5:
Answer:
average mass of 4 boys=45
or, average mass of 4 boys=sum of weight of 4 boys/4
or,45=total weight/4
therefore, total weight=180kgs
when a new boy joins average mass becomes 40,so,
average mass of 5 boys=40
or,avaerage mass of 5 boys=sum of weights of all 5 boys/5
or,40=(180+x)/5[since the total weight of 4 boys was 180 kgs from the previous calculation and considering 'x' as the weight of the new boy]
or,200=180+x
so,x=200-180
x=20
therefore the mass of the fifth boy is 20kg